### 12th Standard EM Chemistry Study material & Free Online Practice Tests - View Model Question Papers with Solutions for Class 12 Session 2019 - 2020 TN Stateboard [ Chapter , Marks , Book Back, Creative & Term Based Questions Papers - Syllabus, Study Materials, MCQ's Practice Tests etc..]

#### 12th Chemistry - Chemistry In Everyday Life Five Marks Questions - by Saroja - Vellore - View & Read

• 1)

What are narcotic and non – narcotic drugs. Give examples

• 2)

What are anti fertility drugs? Give examples.

• 3)

Write a note on co –polymer

• 4)

What are bio degradable polymers? Give examples.

• 5)

How is terylene prepared?

#### 12th Chemistry - Hydroxy Compounds and Ethers Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

What will be the product for the following reaction acetylchloride $\\ \\ \overset { (i)CH_{ 3 }MgBr }{ \underset { (ii){ H }_{ 2 }{ O }^{ + } }{ \longrightarrow } } \times \overset { acid{ k }_{ 2 }{ cr }_{ 2 }{ o }_{ 7 } }{ \longrightarrow } A$ Identify X and A

• 2)

How will you convert acetylene into n-butyl alcohol.

• 3)

Predict the product A,B,X and Y in the following sequence of reaction

3,3 – dimethylbutan -2-ol on treatment with conc. H2SO4 to give tetramethyl ethylene as a major product. Suggest a suitable mechanisms

• 4)

Complete the following reactions

ii) $C_6H_5-CHCH(OH)CH(CH_3)_2 \overset{ConH_2SO_4}\longrightarrow$

• 5)

Phenol is distilled with Zn dust followed by friedel – crafts alkylation with prophyl chloride to give a compound B, B on oxidation gives (c) Indentify A,B and C.

#### 12th Chemistry - Surface Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Give three uses of emulsions.

• 2)

Why does bleeding stop by rubbing moist alum

• 3)

Why is desorption important for a substance to act as good catalyst?

• 4)

Comment on the statement: Colloid is not a substance but it is a state of substance.

• 5)

Explain any one method for coagulation

#### 12th Chemistry - Electro Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Calculate the standard emf of the cell: Cd|Cd2+||Cu2+|Cu and determine the cell reaction.
The standard reduction potentials of Cu2+|Cu and Cd2+|Cd  are 0.34V and -0.40 volts
respectively. Predict the feasibility of the cell reaction.

• 2)

In fuel cell H2and O2 react to produce electricity. In the process, H2 gas is oxidised at the
anode and O2 at cathode. If 44.8 litre of H2 at 250C and also pressure reacts in 10 minutes,
what is average current produced? If the entire current is used for electro deposition of Cu
from Cu2+ , how many grams of deposited?

• 3)

The same amount of electricity was passed through two separate electrolytic cells containing solutions of nickel nitrate and chromium nitrate respectively. If 2.935g of Ni was deposited in the first cell. The amount of Cr deposited in the another cell? Give : molar mass of Nickel and chromium are 58.74 and 52gm-1 respectively.

• 4)

0.1M copper sulphate solution in which copper electrode is dipped at 250C . Calculate the electrode potential of copper. [Given: E0Cu2+|Cu=0.34].

• 5)

For the cell Mg (s) Mg2+(aq)||Ag2+(aq)|Ag(s), calculate the equilibrium constant at 250C and maximum work that can be obtained during operation of cell. Given : $E^{0}_{Mg^{2+}|Mg}$=-237V and $E^{0}|_{Ag^{2+}|Ag}$=0.80V.

#### 12th Chemistry - Ionic Equilibrium Five Marks Questions - by Saroja - Vellore - View & Read

• 1)

Solubility product of Ag2 CrO4 4 is $1\times10^{-12}$.What is the solubility of Ag2 CrO4 in 0.01M AgNO3 solution?

• 2)

Write the expression for the solubility product of Ca3 (PO4)2

• 3)

A saturated solution, prepared by dissolving CaF2(s) in water, has $[Ca^{2+}]=3.3\times10^{-4}M$ What is theKsp of CaF2?

• 4)

Ksp of AgCl is $1.8\times10^{-10}$. Calculate molar solubility in 1 M AgNO3

• 5)

A particular saturated solution of silver chromate Ag2 CrO4 has $[Ag^{+}]=5\times10^{-5}$ and $[CrO_{4}]^{2-}=4.4\times10^{-4}M$.What is the value of Ksp for Ag2 CrO4?

#### 12th Chemistry - Hydroxy Compounds and Ethers Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

What happens when 1-penyl ethanol is treated with acidified KMnO4.

• 2)

Write the mechanism of acid catalysed dehydration of ethanol to give ethane.

• 3)

How is phenol prepared form
i) chloro benzene
ii) isoprophy benzene

• 4)

Explain Kolbe’s reaction

• 5)

Writes the chemical equation for Williamson synthesis of 2-ethoxy – 2- methyl pentane  starting from ethanol and 2 – methyl pentan -2-ol

#### 12th Chemistry - Surface Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

• 2)

What happens when a colloidal sol of Fe(OH)3 and AS2O3 are mixed?

• 3)

What is the difference between a sol and a gel?

• 4)

Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol.

• 5)

Addition of Alum purifies water. Why?

#### 12th Chemistry - Electro Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5$\times$10-4 S cm−1.
i) molar conductivity ozf the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
$\lambda^{0}_{catlon}=248.2\quad S$ cm2 mol-1
$\lambda^{0}_{anlon}=51.8\quad S$ cm2 mol-1

• 2)

Arrange the following solutions in the decreasing order of specific conductance.
i) 0.01M KCl
ii) 0.005M KCl
iii) 0.1M KCl
iv) 0.25 M KCl
v) 0.5 M KCl

• 3)

Why is AC current used instead of DC in measuring the electrolytic conductance?

• 4)

0.1M NaCl solution is placed in two different cells having cell constant 0.5 and 0.25cm-1 respectively. Which of the two will have greater value of specific conductance.

• 5)

A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.

#### 12th Chemistry - Ionic Equilibrium Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Define ionic product of water. Give its value at room temperature.

• 2)

Explain common ion effect with an example

• 3)

Derive an expression for Ostwald’s dilution law

• 4)

Define pH.

• 5)

Calculate the pH of 1.5$\times$10-3Msolution of Ba(OH)2

#### 12th Chemistry - Carbonyl Compounds Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

How is propanoic acid is prepared starting from
(a) an alcohol
(b) an alkylhalide
(c) an alkene

• 2)

A Compound (A) with molecular formula C2H3N on acid hydrolysis gives(B) which reacts with thionylchloride to give compound(C). Benzene reacts with compound (C) in presence of anhydrous AlCl3 to give compound(C). Compound (C) on reduction with gives (D). Identify (A), (B), (C) and D. Write the equations.

• 3)

Identify X and Y.
${ CH }_{ 3 }CO{ CH }_{ 2 }{ CH }_{ 2 }COO{ C }_{ 2 }{ H }_{ 5 }\overset { { CH }_{ 3 }MBgr }{ \longrightarrow } X\overset { { H }_{ 3 }{ O }^{ + } }{ \longrightarrow } Y$

• 4)

Identify A, B and C

• 5)

A hydrocarbon A (molecular formula C8H10)on ozonolysis gives B (C4H6O2) only. Compound C (C3H5Br) on treatment with magnesium in dry ether gives (D) which on treatment with CO2 followed by acidification gives(C). Identify A) Band C.

#### 12th Chemistry - Hydroxy Compounds and Ethers Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

Identify the product (s) is / are formed when 1 – methoxy propane is heated with excess HI. Name the mechanism involved in the reaction

• 2)

Draw the major product formed when 1-ethoxyprop-1-ene is heated with one equivalent of HI

• 3)

Suggest a suitable reagent to prepare secondary alcohol with identical group using Grignard reagent.

• 4)

What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis.

• 5)

Predict the major product, when 2-methyl but -2-ene is converted into an alcohol in each of the following methods.
(i) Acid catalysed hydration
(ii) Hydroboration
(iii) Hydroxylation using bayers reagent

#### 12th Chemistry - Surface Chemistry Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Give two important characteristics of physiscorption

• 2)

Differentiate physisorption and chemisorption

• 3)

In case of chemisorption, why adsorption first increases and then decreases with temperature?

• 4)

Which will be adsorbed more readily on the surface of charcoal and why; NH3 or CO2?

• 5)

Heat of adsorption is greater for chemisorptions than physisorption. Why?

#### 12th Chemistry - Electro Chemistry Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Define anode and cathode

• 2)

Why does conductivity of a solution decrease on dilution of the solution

• 3)

State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.

• 4)

Describe the electrolysis of molten NaCl using inert electrodes

• 5)

#### 12th Chemistry - Ionic Equilibrium Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

What are lewis acids and bases? Give two example for each.

• 2)

Discuss the Lowery – Bronsted concept of acids and bases.

• 3)

Indentify the conjugate acid base pair for the following reaction in aqueous solution
i) HS- (aq) + HF $\rightleftharpoons$ F-(aq) + H2S(aq)
ii) HPO2-+ SO32- $\rightleftharpoons$ PO43-+HSO3-
iii) NH4+ CO32-  $\rightleftharpoons$ NH3+HCO3-

• 4)

Account for the acidic nature of HClO4. In terms of Bronsted – Lowry theory, identify its conjugate base.

• 5)

When aqueous ammonia is added to CuSO4 solution, the solution turns deep blue due to the formation of tetramminecopper (II) complex, ${ [Cu({ H }_{ 2 }O)] }_{ (aq) }^{ 2+ }\rightleftharpoons 4{ NH }_{ 3 }(aq)\rightleftharpoons { [Cu{ ({ NH }_{ 3 }) }_{ 4 }] }_{ (aq) }^{ 2+ }$ among H2O and NH3 Which is stronger Lewis base.

#### 12th Chemistry - Chemistry In Everyday Life One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

Which of the following is an analgesic?

• 2)

Dettol is the mixture of

• 3)

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true

• 4)

Saccharin, an artificial sweetener is manufactured from

• 5)

Drugs that bind to the receptor site and inhibit its natural function are called

#### 12th Chemistry - Biomolecules One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

Which one of the following rotates the plane polarized light towards left?

• 2)

The correct corresponding order of names of four aldoses with configuration given below Respectively is,

• 3)

Which one given below is a non-reducing sugar?

• 4)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

• 5)

Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory. (AIIMS)
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

#### 12th Chemistry - Organic Nitrogen Compounds One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

Which of the following reagent can be used to convert nitrobenzene to aniline

• 2)

The method by which aniline cannot be prepared is

• 3)

Which one of the following will not undergo Hofmann bromamide reaction

• 4)

Assertion : Acetamide on reaction with KOH and bromine gives acetic acid
Reason : Bromine catalyses hydrolysis of acetamide.

• 5)

CH3CH2 Br $\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D'D'is$

#### 12th Chemistry - Carbonyl Compounds One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

The correct structure of the product ‘A’ formed in the reaction

• 2)

The formation of cyanohydrin from acetone is an example of

• 3)

Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

• 4)

In the following reaction, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ Product ‘X’ will not give

• 5)

${ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'$ is

#### 12th Chemistry - Hydroxy Compounds and Ethers One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?

• 2)

Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

• 3)

The X is

• 4)

In the reaction sequence, Ethane $\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow }$ ethan -1, 2 - diol . A and X respectively are

• 5)

Which one of the following is the strongest acid

#### 12th Chemistry - Surface Chemistry One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

For freudlich isotherm a graph of log $\frac{x}{m}$ is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

• 2)

Which of the following is incorrect for physisorption?

• 3)

Which one of the following characteristics are associated with adsorption?

• 4)

Fog is colloidal solution 0 of

• 5)

Assertion : Coagulation power of Al3+ is more than Na+.
Reason : greater the valency of the flocculating ion added, greater is its power to cause precipitation

#### 12th Chemistry - Electro Chemistry One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

The number of electrons that have a total charge of 9650 coulombs is

• 2)

Consider the following half cell reactions.
Mn2+ + 2e− ➝ Mn Eo = -1.18V
Mn2+ ➝Mn3+ e- Eo = -1.51V
The Eo for the reaction 3Mn2+ ➝ Mn+2Mn3+ , and the possibility of the forward reaction are respectively

• 3)

The button cell used is watches function as follows
Zn (s) + Ag2O (s) + H2O (l) ⇌ 2Ag (s) + Zn2+ (aq) + 2OH-(aq)the half cell potentials
are Ag2 O (s) + H2O (l) + 2e- →2Ag (s) + 2OH- (aq) Eo.34V The cell potential will be

• 4)

The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is

• 5) Electrolyte KCl KNO3 HCl NaOAC NaCl Λ- (Scm2 mol-1) 149.9 145.0 426.2 91.0 126.5

Calculate ΛoHoAC using appropriate molar conductances of the electrolytes listed above at infinite dilution in water at 25oC.

#### 12th Chemistry - Ionic Equilibrium One Mark Questions with Answer - by Saroja - Vellore - View & Read

• 1)

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

• 2)

Following solutions were prepared by mixing different volumes of NAOH of HCL different concentrations
1) 60 ML$\frac{M}{10}$HCL+40ML$\frac{M}{10}$NaOH
2) 50 ML$\frac{M}{10}$HCL+45ML$\frac{M}{10}$NaOH
3) 75ML$\frac{M}{5}$HCL+40ML$\frac{M}{5}$NaOH
4) 100 ML$\frac{M}{10}$HCL+100ML$\frac{M}{10}$NaOH
pH of which one of them will be equal to 1?

• 3)

The solubility of BaSO4 in water is 2.42 ×10-3gL-1 at 298K. The value of its solubility product(Ksp) will be (Given molar mass of BaSO4 =233g mol 4-1)

• 4)

pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

• 5)

Conjugate base for bronsted acids H2O and HF are

#### 12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Which of the following is an analgesic?

• 2)

Saccharin, an artificial sweetener is manufactured from

• 3)

Aspirin is a/an

• 4)

Natural rubber has

• 5)

Nylon is an example of

#### 12th Chemistry - Biomolecules Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Which one of the following rotates the plane polarized light towards left?

• 2)

Which one given below is a non-reducing sugar?

• 3)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

• 4)

The central dogma of molecular genetics states that the genetic information flows from

• 5)

In a protein, various amino acids liked together by

#### 12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Which of the following reagent can be used to convert nitrobenzene to aniline

• 2)

The method by which aniline cannot be prepared is

• 3)

CH3CH2 Br $\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D'D'is$

• 4)

Aniline + benzoylchloride $\overset { NaOH }{ \longrightarrow }$C6H5 - NH - COC H this reaction is known as

• 5)

The product formed by the reaction an aldehyde with a prmary amine

#### 12th Standard Chemistry - Carbonyl Compounds Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

The formation of cyanohydrin from acetone is an example of

• 2)

In the following reaction, $HC\equiv \overset { { H }_{ 2 }{ SO }_{ 4 } }{ \underset { HgS{ O }_{ 4 } }{ \longrightarrow } } X$ Product ‘X’ will not give

• 3)

Benzoic acid $\overset { i){ NH }_{ 3 } }{ \underset { ii)\Delta }{ \longrightarrow } } A\overset { NaOBr }{ \longrightarrow } B\overset { NaN{ O }_{ 2 }/HCl }{ \longrightarrow } C\quad 'C'\quad is$

• 4)

Which one of the following reduces tollens reagent

• 5)

Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid

#### 12th Standard Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Which of the following compounds on reaction with methyl magnesium bromide will give tertiary alcohol.

• 2)

In the reaction sequence, Ethane $\overset { HOCl }{ \longrightarrow } A\overset { x }{ \longrightarrow }$ ethan -1, 2 - diol . A and X respectively are

• 3)

Carbolic acid is

• 4)

HO CH2 CH2 – OH on heating with periodic acid gives

• 5)

On reacting with neutral ferric chloride, phenol gives

#### 12th Chemistry - Chemistry In Everyday Life Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Dettol is the mixture of

• 2)

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true

• 3)

Aspirin is a/an

• 4)

Terylene is an example of

• 5)

Which is the monomer of neoprene in the following?

#### 12th Chemistry - Biomolecules Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Glucose(HCN) Product (hydrolysis) Product (HI + Heat) A, the compound A is

• 2)

Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory. (AIIMS)
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.

• 3)

The central dogma of molecular genetics states that the genetic information flows from

• 4)

In a protein, various amino acids liked together by

• 5)

In aqueous solution of amino acids mostly exists in,

#### 12th Chemistry - Organic Nitrogen Compounds Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The method by which aniline cannot be prepared is

• 2)

CH3CH2 Br $\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D'D'is$

• 3)

Which one of the following nitro compounds does not react with nitrous

• 4)

The product formed by the reaction an aldehyde with a prmary amine

• 5)

When aniline reacts with acetic anhydride the product formed is

#### 12th Chemistry - Carbonyl Compounds Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The formation of cyanohydrin from acetone is an example of

• 2)

Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is

• 3)

${ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y\quad 'Y'$ is

• 4)

Predict the product Z in the following series of reactions Ethanoic acid $\overset { { PCI }_{ 5 } }{ \longrightarrow } X\overset { { C }_{ 6 }{ H }_{ 6 } }{ \underset { Anhydrous\quad AlcI }{ \longrightarrow } } Y\overset { 1){ CH }_{ 3 }MgBr }{ \underset { II){ H }_{ 3 }{ O }^{ + } }{ \longrightarrow } } Z.$

• 5)

Which of the following represents the correct order of acidity in the given compounds

#### 12th Chemistry - Hydroxy Compounds and Ethers Model Question Paper - by Saroja - Vellore - View & Read

• 1)

An alcohol (x) gives blue colour in victormayer’s test and 3.7g of X when treated with metallic sodium liberates 560 mL of hydrogen at 273 K and 1 atm pressure what will be the possible structure of X?

• 2)

Which one of the following will react with phenol to give salicyladehyde after hydrolysis.

• 3)

(CH3)3-C-CH(OH) CH3 $\overset { con{ H }_{ 2 }{ SO }_{ 4 } }{ \longrightarrow }$X (major product)

• 4)

In the reaction Ethanol $\overset { { PCl }_{ 5 } }{ \longrightarrow } X\overset { alc.KOH }{ \longrightarrow } Y\overset { { H }_{ 2 }{ SO }_{ 4 }/{ H }_{ 2 }O }{ \underset { 298k }{ \longrightarrow } } Z.$ The ‘Z’ is

• 5)

Which of the following compound can be used as artireeze in automobile rediators?

#### 12th Chemistry - Surface Chemistry Model Question Paper - by Saroja - Vellore - View & Read

• 1)

For freudlich isotherm a graph of log $\frac{x}{m}$ is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

• 2)

Which one of the following characteristics are associated with adsorption?

• 3)

Hair cream is

• 4)

The phenomenon observed when a beam of light is passed through a colloidal solution is

• 5)

In an electrical field, the particles of a colloidal system move towards cathode. The coagulation of the same sol is studied using K2SO4 (i), Na3 PO4 (ii),K4 [Fe(CN)6] (iii) and NaCl (iv) Their coagulating power should be

#### 12th Chemistry - Electro Chemistry Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The number of electrons that have a total charge of 9650 coulombs is

• 2)

The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is

• 3)

During electrolysis of molten sodium chloride, the time required to produce 0.1mol of chlorine gas using a current of 3A is

• 4)

• 5)

In the electrochemical cell: Zn|ZnSO4 (0.01M)|| CuSO4 (1.0M)| Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that CuSO4 changed to 0.01M, the emf changes to E2. From the followings, which one is the relationship between E1 and E2?

#### 12th Chemistry - Ionic Equilibrium Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

• 2)

pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

• 3)

Conjugate base for bronsted acids H2O and HF are

• 4)

Which will make basic buffer?

• 5)

The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively

#### 12th Standard Chemistry - Term II Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 2)

Cupellation is a process used for the refining of

• 3)

The basic structural unit of silicates is (NEET)

• 4)

Most easily liquefiable gas is

• 5)

Which of the following oxidation states is most common among the lanthanoids?

#### 12th Standard Chemistry - Electro Chemistry Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

The number of electrons that have a total charge of 9650 coulombs is

• 2)

The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is

• 3)

During electrolysis of molten sodium chloride, the time required to produce 0.1mol of chlorine gas using a current of 3A is

• 4)

Which of the following electrolytic solution has the least specific conductance

• 5)

Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

#### 12th Standard Chemistry - Surface Chemistry Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

For freudlich isotherm a graph of log $\frac{x}{m}$ is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to

• 2)

Which of the following is incorrect for physisorption?

• 3)

Hair cream is

• 4)

The most effective electrolyte for the coagulation of AS2S3Sol is

• 5)

The phenomenon observed when a beam of light is passed through a colloidal solution is

#### 12th Standard Chemistry - Ionic Equilibrium Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is

• 2)

pH of a saturated solution of Ca(OH)2 is 9. The Solubility product ( Ksp) of Ca(OH)2

• 3)

Which will make basic buffer?

• 4)

Which of these is not likely to act as lewis base?

• 5)

The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide are respectively

#### 12th Standard Chemistry - Chemical Kinetics Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

For a first order reaction A ⟶ product with initial concentration x mol L-1, has a half life period of 2.5 hours. For the same reaction with initial concentration $\left( \frac { x }{ 2 } \right)$ mol L-1 the half life is

• 2)

The decomposition of phosphine (PH3) on tungsten at low pressure is a first order reaction. It is because the (NEET)

• 3)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

• 4)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and kJ mol-1 Therefore , the energy of activation in the backward direction is

• 5)

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK-1mol-1)

#### 12th Standard Chemistry - Solid State Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

• 2)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 3)

The number of carbon atoms per unit cell of diamond is

• 4)

CsCl has bcc arrangement, its unit cell edge length is 400pm, its inter atomic distance is

• 5)

The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length oif the edge of the unit cell is

#### 12th Standard Chemistry - Coordination Chemistry Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 2)

An excess of silver nitrate is added to 100ml of a 0.01M solution of pentaaquachloridochromium(III)chloride. The number of moles of AgCl precipitated would be

• 3)

IUPAC name of the complex K3[Al(C2O4)3] is

• 4)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

• 5)

In which of the following coordination entities the magnitude of Δ0 will be maximum?

#### 12th Standard Chemistry - Ionic Equilibrium Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Define ionic product of water. Give its value at room temperature.

• 2)

Explain common ion effect with an example

• 3)

Define pH.

• 4)

Calculate the pH of 1.5$\times$10-3Msolution of Ba(OH)2

• 5)

50ml of 0.05M HNO3 is added to 50ml of 0.025M KOH. Calculate the pH of the resultant solution.

#### 12th Standard Chemistry - Electro Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

The conductivity of a 0.01M solution of a 1 :1 weak electrolyte at 298K is 1.5$\times$10-4 S cm−1.
i) molar conductivity ozf the solution
ii) degree of dissociation and the dissociation constant of the weak electrolyte
Given that
$\lambda^{0}_{catlon}=248.2\quad S$ cm2 mol-1
$\lambda^{0}_{anlon}=51.8\quad S$ cm2 mol-1

• 2)

Arrange the following solutions in the decreasing order of specific conductance.
i) 0.01M KCl
ii) 0.005M KCl
iii) 0.1M KCl
iv) 0.25 M KCl
v) 0.5 M KCl

• 3)

Why is AC current used instead of DC in measuring the electrolytic conductance?

• 4)

0.1M NaCl solution is placed in two different cells having cell constant 0.5 and 0.25cm-1 respectively. Which of the two will have greater value of specific conductance.

• 5)

A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.

#### 12th Standard Chemistry - Surface Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Peptising agent is added to convert precipitate into colloidal solution. Explain with an example.

• 2)

What happens when a colloidal sol of Fe(OH)3 and AS2O3 are mixed?

• 3)

What is the difference between a sol and a gel?

• 4)

Why are lyophillic colloidal sols are more stable than lyophobilc colloidal sol.

• 5)

Addition of Alum purifies water. Why?

#### 12th Standard Chemistry - Transition and Inner Transition Elements Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

• 2)

the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

• 3)

The alloy of copper that contain Zinc is

• 4)

Permanganate ion changes to ________ in acidic medium

• 5)

MnO4- react with Br- in alkaline PH to give

#### 12th Standard Chemistry - p - Block Elements - II Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

In which of the following , NH3 is not used?

• 2)

The molarity of given orthophosphoric acid solution is 2M. its normality is

• 3)

The correct order of the thermal stability of hydrogen halide is

• 4)

On oxidation with iodine, sulphite ion is transformed to

• 5)

When copper is heated with conc HNO3 it produces

#### QUARTERLY EXAM - 2019 - by KRP Matriculation Hr Sec School - View & Read

• 1)

Match items in column - I with the items of column – II and assign the correct code.

 Column-I Column-II A. Cyanide process (i) Ultrapure Ge B Froth floatation process (ii) Dressing of ZnS C Electrolytic reduction (iii) Extraction of Al D Zone refining (iv) Extraction of Au (v) Purification of Ni
• 2)

Which of the following is not true with respect to Ellingham diagram?

• 3)

Which of the following is not sp2 hybridised?

• 4)

Which one of the following compounds has similar structure to that of graphite?

• 5)

Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively

#### 12th Standard Chemistry - Chemical Kinetics Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

The rate of formation of a dimer in a second order reaction is 7.5 X 10-3mol L-1 s-1 monomer concentration. Calculate the rate constant.

• 2)

For a reaction x+y+z$\longrightarrow$ productsthe rate law is given by ratek =k[x]3/2[y]1/2 what is the overall order of the reaction and what is the order of the reaction with respect to z.

• 3)

Explain briefly the collision theory of bimolecular reactions

• 4)

Write Arrhenius equation and explains the terms involved

• 5)

The decomposition of Cl2O7 at 500K in the gas phase to Cl2 and O2 is a first order reaction. After 1 minute at 500K, the pressure of Cl2O7 falls from 0.08 to 0.04 atm. Calculate the rate constant in s-1

#### 12th Chemistry - Solid State Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Explain Schottky defect.

• 2)

Write short note on metal excess and metal deficiency defect with an example

• 3)

Calculate the number of atoms in a fcc unit cell

• 4)

Explain AAAA and ABABA and ABCABC type of three dimensional packing with the help of neat diagram.

• 5)

Why ionic crystals are hard and brittle?

#### 12th Standard Chemistry - Coordination Chemistry Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Give an example for complex of the type [Ma2b2c2] where a, b, c are monodentate ligands and give the possible isomers.

• 2)

Give one test to differentiate [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl.

• 3)

In an octahedral crystal field, draw the figure to show splitting of d orbitals

• 4)

What is linkage isomerism? Explain with an example

• 5)

Write briefly about the applications of coordination compounds in volumetric analysis

#### 12th Standard Chemistry - Transition and Inner Transition Elements Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

What are interstitial compounds?

• 2)

Calculate the number of unpaired electrons in Ti3+ , Mn2+ and calculate the spin only magnetic moment.

• 3)

Write the electronic configuration of Ce4+ and Co2+.

• 4)

Explain briefly how +2 states becomes more and more stable in the first half of the first row transition elements with increasing atomic number.

• 5)

Which is more stable? Fe3+ or Fe2+ - explain.

#### 12th Chemistry - p - Block Elements - II Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Give the balanced equation for the reaction between chlorine with cold NaOh and hot NaOH.

• 2)

How will you prepare chlorine in the laboratory?

• 3)

Give the uses of sulphuric acid.

• 4)

Give a reason to support that sulphuric acid is a dehydrating agent.

• 5)

Write the reason for the anamolous behaviour of Nitrogen.

#### 12th Chemistry - p - Block Elements - I Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Give the uses of silicones

• 2)

AlCl3 behaves like a lewis acid. Substantiate this statement.

• 3)

Describe the structure of diborane

• 4)

Write a short note on hydroboration

• 5)

Give one example for each of the following
(i) icosogens
(ii) tetragen
(iii) prictogen
(iv) chalcogen

#### 12th Chemistry - Metallurgy Three Marks Questions - by Saroja - Vellore - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) it is possible to reduce Fe2O3 by coke at a temperature around 1200K

• 3)

Give the uses of zinc.

• 4)

Explain the electrometallurgy of aluminium

• 5)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

#### 12th Standard Chemistry - p - Block Elements - I Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

An aqueous solution of borax is

• 2)

The element that does not show catenation among the following p-block elements is

• 3)

Oxidation state of carbon in its hydrides

• 4)

The geometry at which carbon atom in diamond are bonded to each other is

• 5)

The stability of +1 oxidation state increases in the sequence

#### 12th Standard Chemistry - Metallurgy Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Bauxite has the composition

• 2)

Electrochemical process is used to extract

• 3)

Zinc is obtained from ZnO by

• 4)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

• 5)

Which of the following is used for concentrating ore in metallurgy?

#### 12th Chemistry - Term 1 Model Question Paper - by Kala - Bodinayakanur - View & Read

• 1)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 2)

Cupellation is a process used for the refining of

• 3)

Oxidation state of carbon in its hydrides

• 4)

Which of these is not a monomer for a high molecular mass silicone polymer?

• 5)

Among the following, which is the strongest oxidizing agent?

#### 12th Chemistry - Chemical Kinetics Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Define average rate and instantaneous rate

• 2)

Define rate law and rate constant

• 3)

Derive integrated rate law for a zero order reaction A$\longrightarrow$ product

• 4)

Explain the effect of catalyst on reaction rate with an example

• 5)

The rate law for a reaction of A, B and C has been found to be rate =k[A]2[B][L]3/2 How would the rate of reaction change when
(i) Concentration of [L] is quadrupled
(ii) Concentration of both [A] and [B] are doubled
(iii) Concentration of [A] is halved
(iv) Concentration of [A] is reduced to $\left( 1/3 \right)$ and concentration of [L] is quadrupled.

#### 12th Chemistry Chapter 6 Solid State Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Define unit cell

• 2)

Give any three characteristics of ionic crystals.

• 3)

Differentiate crystalline solids and amorphous solids.

• 4)

classify the following solids
a. P4
b. Brass
c. diamond
d. NaCl
e. Iodine

• 5)

Explain briefly seven types of unit cell

#### 12th Chemistry - Coordination Chemistry Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH3)(Cl)5]
(ii) Cr(NH3)5Cl]3[CoF6]2
(iii) [Cr(NH3)3Cl3]

• 2)

Based on VB theory explain why [Cr(NH3)6]3+ is paramagnetic, while [Ni(CN)4]2- is diamagnetic.

• 3)

Draw all possible geometrical isomers of the complex [Co(en)2]+ and identify the optically active isomer.

• 4)

[Ti(H2O)6]3+ is coloured, while [Sc(H2O)6]3+ is colourless- explain

• 5)

Name the following complex using IUPAC norms. [Co(en)2 (ONO)CI]CI

#### 12th Chemistry Chapter 4 Transition and Inner Transition Elements Two Marks Question - by Saroja - Vellore - View & Read

• 1)

Explain the oxidation states of 3d series elements.

• 2)

Justify the position of lanthanides and actinides in the periodic table.

• 3)

What are actinides? Give three example

• 4)

complete the following.
a. MnO42- + H+ ⟶|?
b. C6H5CH3 $\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } }$?
c. MnO4- + Fe2+ ⟶?
d. KMnO4 $\overset { \triangle }{ \underset { Red\quad hot }{ \longrightarrow } }$ ?
e. Cr2O72- + I- + H+ ⟶?
f. Na2Cr2O7 + KCl ⟶?

• 5)

Write ionic equation for the reaction between Cr2O7-2 iODS and Fe2+ ions in acidic medium.

#### 12th Chemistry - p - Block Elements - II Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

What is inert pair effect?

• 2)

Give the oxidation state of halogen in the following.
a) OF2
b) O2F2
c) Cl2O3
d) I2O4

• 3)

What are interhalogen compounds? Give examples.

• 4)

What is the hybridisation of iodine in IF7? Give its structure?

• 5)

How is nitrogen prepared from liquid air?

#### 12th Standard Chemistry Unit 2 p - Block Elements - I Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

Write a short note on anamolous properties of the first element of p-block

• 2)

Describe briefly allotropism in p- block elements with specific reference to carbon

• 3)

Give the uses of Borax

• 4)

Write a note on Fisher tropsch synthesis

• 5)

Give the structure of CO and CO2.

#### 12th Chemistry Unit 1 Metallurgy Two Marks Questions - by Saroja - Vellore - View & Read

• 1)

What is the difference between minerals and ores?

• 2)

What are the various steps involved in extraction of pure metals from their ores?

• 3)

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

• 4)

Describe a method for refining nickel

• 5)

What is metallurgy?

#### 12th Chemistry - Term 1 Five Mark Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Explain the principle of electrolytic refining with an example.

• 2)

Give the limitations of Ellingham diagram

• 3)

Write a note on zeolites.

• 4)

What happens when PCl5 is heated?

• 5)

What type of hybridisation occur in
a) BrF5
b) BrF3

#### 12th Chemistry Quarterly Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Cupellation is a process used for the refining of

• 3)

Boric acid is an acid because its molecule (NEET)

• 4)

The molarity of given orthophosphoric acid solution is 2M. its normality is

• 5)

The alloy of copper that contain Zinc is

#### 12th Standard Chemistry Unit 7 Chemical Kinetics Book Back Questions - by Saroja - Vellore - View & Read

• 1)

For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

• 2)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

• 3)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol-4 and kJ mol-1 Therefore , the energy of activation in the backward direction is

• 4)

Assertion: rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
Reason: rate constant also doubles

• 5)

If the initial concentration of the reactant is doubled, the time for half reaction is also doubled. Then the order of the reaction is

#### 12th Standard Chemistry Unit 6 Solid State Book Back Questions - by Saroja - Vellore - View & Read

• 1)

Graphite and diamond are

• 2)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 3)

The number of carbon atoms per unit cell of diamond is

• 4)

The composition of a sample of wurtzite is FeO0.931.00 what % of Iron present in the form of Fe3+?

• 5)

A solid compound XY has NaCl structure. if the radius of the cation is 100pm , the radius of the anion will be

#### 12th Standard Chemistry Chapter 5 Coordination Chemistry Book Back Questions - by Saroja - Vellore - View & Read

• 1)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 2)

IUPAC name of the complex K3[Al(C2O4)3] is

• 3)

Crystal field stabilization energy for high spin d5 octahedral complex is

• 4)

Which type of isomerism is exhibited by [Pt(NH3)2Cl2]?

• 5)

How many geometrical isomers are possible for<<EVA035.eps>>?

#### 12th Standard Chemistry - p Block Elements - II Book Back Questions - by Saroja - Vellore - View & Read

• 1)

In which of the following , NH3 is not used?

• 2)

P4O6 reacts with cold water to give

• 3)

The molarity of given orthophosphoric acid solution is 2M. its normality is

• 4)

The correct order of the thermal stability of hydrogen halide is

• 5)

Most easily liquefiable gas is

#### 12th Standard Chemistry - Transition and Inner Transition Elements Book Back Questions - by Saroja - Vellore - View & Read

• 1)

Which of the following d block element has half filled penultimate d sub shell as well as half filled valence sub shell?

• 2)

the catalytic behaviour of transition metals and their compounds is ascribed mainly due to

• 3)

The correct order of increasing oxidizing power in the series

• 4)

Which of the following statements is not true?

• 5)

Permanganate ion changes to ________ in acidic medium

#### 12th Standard Chemistry Unit 2 p - Block Elements - I Book Back Questions - by Saroja - Vellore - View & Read

• 1)

The element that does not show catenation among the following p-block elements is

• 2)

Oxidation state of carbon in its hydrides

• 3)

Which of the following is not sp2 hybridised?

• 4)

AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

• 5)

The stability of +1 oxidation state increases in the sequence

#### 12th Standard Chemistry Metallurgy Book Back Questions - by Saroja - Vellore - View & Read

• 1)

In the electrolytic refining of copper, which one of the following is used as anode?

• 2)

Which of the following plot gives Ellingham diagram

• 3)

In the Ellingham diagram, for the formation of carbon monoxide

• 4)

Which of the following reduction is not thermodynamically feasible?

• 5)

Which of the following is not true with respect to Ellingham diagram?

#### 12th Standard Chemistry Chapter 1 Metallurgy One Mark Question and Answer - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Which of the metal is extracted by Hall-Heroult process?

• 3)

Which of the following is commonly used to produce foam in froth floatation process?

• 4)

Among the following, one does not belong to calcination, Pick the odd one out.

• 5)

Which of the following is incorrect with respect to metallurgy of iron in the blast furnace?

#### 12th Standard Chemistry Unit 7 Chemical Kinetics One Mark Question and Answer - by Saroja - Vellore - View & Read

• 1)

For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

• 2)

A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

• 3)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

• 4)

For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10-4 mol L-1s-1. Identify the rate of reaction.

• 5)

For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.

#### 12th Standard Chemistry - Solid State One Mark Question with Answer - by Saroja - Vellore - View & Read

• 1)

Graphite and diamond are

• 2)

An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying entre of the cube. the correct formula of AxBy is

• 3)

The number of unit cells in 8 gm of an element X ( atomic mass 40) which crystallizes in bcc pattern is (NA is the Avogadro number)

• 4)

Which of the following is characteristic of ionic solids?

• 5)

An example of metal deficiency defect

#### 12th Chemistry - Coordination Chemistry - One Mark Question and Answer - by Saroja - Vellore - View & Read

• 1)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

• 2)

Crystal field stabilization energy for high spin d5 octahedral complex is

• 3)

In which of the following coordination entities the magnitude of Δ0 will be maximum?

• 4)

The total number of electrons donated by ligands to platinum ion in [Pt(en)2CI2] is

• 5)

Primary and secondary valencies of Cu in [Cu(NH3)4]SO4 is

#### 12th Chemistry Chapter 6 Solid State One Mark Question with Answer Key - by Saroja - Vellore - View & Read

• 1)

Graphite and diamond are

• 2)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 3)

The number of carbon atoms per unit cell of diamond is

• 4)

The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. the coordination number of each ion in AB is

• 5)

Which of the following cannot be regarded as molecular solid?

#### 12th Chemistry Unit 4 Transition and Inner Transition Elements One Mark Question with Answer Key - by Saroja - Vellore - View & Read

• 1)

Sc( Z=21) is a transition element but Zinc (z=30) is not becaus

• 2)

The correct order of increasing oxidizing power in the series

• 3)

The alloy of copper that contain Zinc is

• 4)

In acid medium, potassium permanganate oxidizes oxalic acid to

• 5)

Which of the following statements is not true?

#### 12th Chemistry Unit 3 p - Block Elements - II One Mark Question Paper with Answer Key - by Saroja - Vellore - View & Read

• 1)

In which of the following , NH3 is not used?

• 2)

Which is true regarding nitrogen?

• 3)

In the brown ring test, brown colour of the ring is due to

• 4)

On hydrolysis, PCl3 gives

• 5)

P4O6 reacts with cold water to give

#### 12th Chemistry Unit 2 p - Block Elements - I One Mark Question Paper - by Saroja - Vellore - View & Read

• 1)

An aqueous solution of borax is

• 2)

Boric acid is an acid because its molecule (NEET)

• 3)

In diborane, the number of electrons that accounts for banana bonds is

• 4)

The element that does not show catenation among the following p-block elements is

• 5)

Carbon atoms in fullerene with formula C60 have

#### 12th Chemistry Chapter 1 Metallurgy One Mark Question Paper - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Which of the metal is extracted by Hall-Heroult process?

• 3)

Electrochemical process is used to extract

• 4)

Zinc is obtained from ZnO by

• 5)

Which of the following is used for concentrating ore in metallurgy?

#### 12th Chemistry Solid State Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Graphite and diamond are

• 2)

In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

• 3)

The ionic radii of A+ and B are 098X10-10 mand 1.81X10-10. m. the coordination number of each ion in AB is

• 4)

if ‘a’ stands for the edge length of the cubic system ; sc , bcc, and fcc. Then the ratio of radii of spheres in these systems will be respectively

• 5)

Which one of the following crystal has 8: 8 structure?

#### 12th Chemistry Unit 5 Coordination Chemistry Model Question Paper - by Saroja - Vellore - View & Read

• 1)

The sum of primary valance and secondary valance of the metal M in the complex [M(en)2(Ox)]Cl isL

• 2)

A magnetic moment of 1.73BM will be shown by one among the following (NEET)

• 3)

How many geometrical isomers are possible for<<EVA035.eps>>?

• 4)

Fac-mer isomerism is shown by

• 5)

Choose the correct statement

#### 12th Standard Chemistry Chemical Kinetics Model Question Paper - by Saroja - Vellore - View & Read

• 1)

For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M , the concentration of A after one hour is given by the expression.

• 2)

A zero order reaction X ⟶ XProduct, with an initial concentration 0.02M has a half life of 10 min. if one starts with concentration 0.04M, then the half life is

• 3)

The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

• 4)

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 200K to 400K? (R = 8.314 JK-1mol-1)

• 5)

In a first order reaction $x\longrightarrow y$ if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is

#### 12th Standard Chemistry Chapter 6 Solid State Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Graphite and diamond are

• 2)

The number of carbon atoms per unit cell of diamond is

• 3)

The vacant space in bcc lattice unit cell is

• 4)

Which of the following cannot be regarded as molecular solid?

• 5)

Which of the following is characteristic of ionic solids?

#### 12th Standard Chemistry First Mid Term Model Question Paper - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Wolframite ore is separated from tinstone by the process of

• 3)

Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET-2018)

• 4)

AlF3 is soluble in HF only in the presence of KF. It is due to the formation of (NEET)

• 5)

The cation leaves its normal position in the crystal and moves to some interstitial position, the defect in the crystal is known as

#### 12th Standard Chemistry Chapter 4 Transition and Inner Transition Elements Important Question Paper - by Saroja - Vellore - View & Read

• 1)

Which one of the following ions has the same number of unpaired electrons as present in V3+?

• 2)

The magnetic moment of Mn2+ ion is

• 3)

Which of the following compounds is colourless?

• 4)

Which of the following is wrong with respect to lanthanide contraction?

• 5)

Hybridisation of chromium ions and dichromate ions is

#### 12th Standard Chemistry Chapter 3 p - Block Elements - II Important Question Paper - by Saroja - Vellore - View & Read

• 1)

In which of the following , NH3 is not used?

• 2)

Which is true regarding nitrogen?

• 3)

An element belongs to group 15 and 3 rd period of the periodic table, its electronic configuration would be

• 4)

S-S bond is present in

• 5)

Pick the wrong one among the following

#### 12th Standard Chemistry Unit 2 p - Block Elements - I Important Question Paper - by Saroja - Vellore - View & Read

• 1)

An aqueous solution of borax is

• 2)

Boric acid is an acid because its molecule (NEET)

• 3)

Which among the following is not a borane?

• 4)

Lewis acid character of boron trihalides is as a follows:

• 5)

Select the incorrect statement regarding B2H6.

#### 12th Chemistry - Unit 1 Important Question Paper - by Saroja - Vellore - View & Read

• 1)

Bauxite has the composition

• 2)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 3)

Which one of the following reaction represents calcinations?

• 4)

Which of the following is not a mineral of aluminium?

• 5)

Which of the following is commonly used to produce foam in froth floatation process?

#### model test question paper for new syllabus state board english medium in chemistry chapter one metallurgy - by Mohan Raj - View & Read

• 1)

Bauxite has the composition

• 2)

Roasting of sulphide ore gives the gas (A).(A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

• 3)

Which one of the following reaction represents calcinations?

• 4)

The metal oxide which cannot be reduced to metal by carbon is

• 5)

Which of the metal is extracted by Hall-Heroult process?

#### chemistrty most asked creative five mark questions in chapter one english medium - by Mohan Raj - View & Read

• 1)

List out the application of aluminum

• 2)

List the applications of iron

• 3)

How can you separate alumina from silica in a bauxite ore

• 4)

What is zone refining? Describe the principle involved in the purification of the metal by this method.

• 5)

Write short note on the following:
(i) The process in which no external reducing agent is used.
(ii) The process which is used for highly electro positive metal.
(iii) Write the equation involved in the thermite process.

#### chapter one creative five mark questions chemistry english medium - by Mohan Raj - View & Read

• 1)

Explain froth flotation, with diagram.

• 2)

Explain concentration by magnetic separation with diagram.

• 3)

In the extraction of copper, explain the smelting process.

• 4)

Explain refining of nickel by mond's process

• 5)

Explain refming of titanium by Van-Arkel method.

#### english medium stateboard most important five mark questuions in chemistry chapter one metallurgy - by Mohan Raj - View & Read

• 1)

Describe the role of the following in the process mentioned.
(i) Silica in the extraction of copper.
(ii) Cryolite in the extraction of aluminium.
(iii) Iodine in the refining of Zirconium.
(iv) Sodium cyanide in froth floatation.

• 2)

Explain the principle of electrolytic refining with an example.

• 3)

The selection of reducing agent depends on the thermodynamic factor: Explain with an example.

• 4)

Give the limitations of Ellingham diagram

• 5)

Write a short note on electrochemical principles of metallurgy.

#### important three mark questions in chemistry metallurgy for state board english medium - by Mohan Raj - View & Read

• 1)

Write the molecular composition of the following ores and mentions it metal : magnetite) calamine and bauxite.

• 2)

(i) Which of the following metals cannot: be extracted by the smelting process : 1 AI, Zn, Fe and Pb. Give reasons.
(ii) Which one is a good reducing agent (C or CO) for Fe2O3, below 1073 k?

• 3)

What is coupling of reaction? How is it useful in metallurgy?

• 4)

Explain how the metal oxide is converted into metal using carbon as a reducing agent.

• 5)

How oxides of metals are reduced by hydrogen?

#### chemistry chapter one creative three mark questions for +2 english medium - by Mohan Raj - View & Read

• 1)

Explain alkali leaching in the extraction of aluminum,

• 2)

How is acid leaching done for the sulphide ores?

• 3)

Before reduction, the ore is first convertedI into the oxide of metal of interest. Gtve reason

• 4)

Explain roasting with an example.

• 5)

Explain calcination with an example.

#### Frequently asked three mark questions chemistry 12th standard unit one metallurgy in chemistry - by Mohan Raj - View & Read

• 1)

Explain zone refining process with an example using the Ellingham diagram given below

• 2)

(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) Carbon monoxide is more effective reducing agent than carbon below 983K but, above this temperature, the reverse is true –Explain.
(c) it is possible to reduce Fe2O3 by coke at a temperature around 1200K

• 3)

Give the uses of zinc.

• 4)

Explain the electrometallurgy of aluminium

• 5)

Explain the following terms with suitable examples.
(i) Gangue
(ii) slag

#### state board english medium chemistry metallurgy Important finding wrong statement questions in chemistry - by Mohan Raj - View & Read

• 1)

a) The crude metal is refined by electrolysis.
b) The rods of impure metal are used as cathode.
c) Thin strips of pure metal are used as cathode.
d) Less electropositive impurities removed as anode mud.

• 2)

a)Van-Arkel method used for refining Zirconium.
b) Aluminium is a bad conductor of heat.
c) Aluminium shows high resistance to corrosion.
d) Aluminium is a good conductor of heat

• 3)

a) Aluminium is used to produce die-castings
b) Gold nanopartides used as an catalysts
c) Copper is the first metal used by the human
d) Brass is an alloy of zinc and copper

• 4)

a) Germanium is used as an semi conductor
b) Stainless steel is an important alloy of Aluminum
c) Zinc sulphide is used in making luminous paints.
d) Brass an alloy of zinc is used in water valves

• 5)

a) Metallic oxides can be reduced by an alumino thermitc process.
b) Flux + gangue$\rightarrow$ slag
c) Silica gangue present in the ore is basic in nature
d) Cu2S + FeS $\rightarrow$Copper matter

### TN Stateboard Education Study Materials

Practical Notes

#### 12th Stateboard Chemistry 2019 - 2020 Academic Monthly Syllabus - by Saroja - Vellore Aug 02, 2019 Aug 02, 2019

Chemistry 2019 - 2020 Academic Monthly Syllabus

### TN Stateboard Updated Class 12th Chemistry Syllabus

#### Metallurgy

Introduction - Occurrence of metals - Concentration of ores - Extraction of crude metal - Thermodynamic principle of metallurgy - Electrochemical principle of metallurgy - Refining process - Application metals -

#### p - Block Elements - I

Introduction - General trends in properties of p-block elements - Group 13 (Boron group) elements - Group 14 (Carbon group) elements -

#### p - Block Elements - II

Introduction - Group 15 (Nitrogen group) elements - oxygen - Group 17 (Halogen group) elements - Group 18 (Inert gases) elements -

#### Transition and Inner Transition Elements

Introduction - Position of d- block elements in the periodic table - Electronic configuration - General trend in properties - important compound of Transition elements

#### Coordination Chemistry

Introduction - Coordination compounds and double salts - Werner's theory of coordination compounds - Definition of important terms pertaining to co-ordination compounds - Nomenclature of coordination compounds - Isomerism in coordination compounds - Theories of coordination compound

#### Solid State

Introduction - General characteristics of solids - Classification of solids - Classification of crystalline solids - Classification of crystalline solids - Primitive and non-primitive unit cell - Packing in crystals - Imperfection in solids

#### Chemical Kinetics

Introduction - Rate of a chemical reaction - Molecularity - The integrated rate equation - Half-life period of a reaction - Collision theory - Arrhenius equation – The effect of temperature on reaction rate - Factors affecting the reaction rate

#### TN StateboardStudy Material - Sample Question Papers with Solutions for Class 12 Session 2019 - 2020

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