Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

(a)

\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS₂ and H₂S

(b)

\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

(c)

Roasting of the sulphide to its oxide is thermodynamically feasible

(d)

Carbon and hydrogen are suitable reducing agents for metal sulphides

Which of the following reduction is not thermodynamically feasible?

(a)

\({ Cr }_{ 2 }{ O }_{ 3 }+2Al\longrightarrow { Al }_{ 2 }{ O }_{ 3 }+2Cr\)

(b)

\(\mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr} \longrightarrow \mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al}\)

(c)

\(3Ti{ O }_{ 2 }+4Al\longrightarrow 2A{ l }_{ 2 }{ O }_{ 3 }+3Ti\)

(d)

none of these

\(2PbS+{ 3O }_{ 2 }\longrightarrow 2pbO+{ 2SO }_{ 2 }\) Name the process ________.

(a)

Roasting

(b)

Calcination

(c)

Smelting

(d)

Leaching

Ignition mixture used in aluminothermite process is ________.

(a)

Cr + AI₂O₃

(b)

Mg + BaO₂

(c)

AI + Cr₂O₃

(d)

Ba+MgO

Magnesite is_______.

(a)

Magnesium oxide

(b)

Magnesium carbonate

(c)

Magnesium sulphate

(d)

Magnesium chloride

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

(a)

Tetrahedral

(b)

hexagonal

(c)

Octahedral

(d)

none of these

The stability of +1 oxidation state increases in the sequence ________.

(a)

Al < Ga < In < Tl

(b)

Tl < In < Ga < Al

(c)

In < Tl < Ga < Al

(d)

Ga< In < Al < Tl

Lewis acid character of boron trihalides is as a follows _______.

(a)

BF₃ > BCl₃ > BBr₃ > BI₃

(b)

BCI₃ > BF₃ > BBr₃ > BI₃

(c)

BI₃ > BBr₃ > BCl₃ > BF₃

(d)

BI₃ > BF₃ > BCl₃ > BBr₃

Which one is correct statement for zeolite?

(a)

Zeolites are aluminosilicates having three dimensional framework

(b)

Hydrate zeolites are used as ion exchangers in hardening of soft water

(c)

Zeolites are alumino silicates

(d)

all the above

Borax is _______.

(a)

Na₂[B₄O₅(OH)₄).8H₂O

(b)

Na₂[B₄O₅(OH)₆).7H₂O

(c)

Na₂[B₄O₃(OH)₈].6H₂O

(d)

Na₂[B₄O₂(OH)₁₀).5H₂O

Among the following, which is the strongest oxidizing agent?

(a)

Cl₂

(b)

F₂

(c)

Br₂

(d)

l₂

On oxidation with iodine, sulphite ion is transformed to _______.

(a)

S₄O₆^2-

(b)

S₂O₆^2-

(c)

SO₄^2-

(d)

SO₃^2-

Which of the following is correct?

(a)

H₃PO₃ is dibasic and reducing

(b)

H₃PO₃ is dibasic and non-reducing

(c)

H₃PO₄ is tribasic and reducing

(d)

H₃PO₃ is tribasic and non-reducing

Allotrope of sulphur which shows paramagnetic behaviour _______.

(a)

S₈- Rhombic

(b)

S₈- Monoclinic

(c)

S₂- In vapour phase

(d)

Not possible

Orthophosphorus acid on heating gives______.

(a)

Hypophosphorus

(b)

Orthophosphoric acid

(c)

Phosphine gas

(d)

both (b) and (c)

Which of the following compounds is colourless?

(a)

Fe³⁺

(b)

Ti⁴⁺

(c)

Co²⁺

(d)

Ni²⁺

MnO₄^- react with Br^- in alkaline P^H to give ________.

(a)

BrO₃^- MnO₂

(b)

Br₂, MnO₄^2-

(c)

Br₂, MnO₂

(d)

BrO^-, MnO₄^2-

Except ________ all element from Rf to Cn, are synthetically prepared and have very low half life periods.

(a)

cadmium

(b)

actinium

(c)

yttrium

(d)

cadmium

Of these statement, which statement is incorrect in most of the transition elements are _______.

(a)

hexagonal close packed

(b)

cubic close packed

(c)

face centered cubic

(d)

symmetrical distribution

If the standard electrode potential (E^o) of a inetal is ________ and __________ the metal is a powerful reducing agent.

(a)

large, negative

(b)

large, positive

(c)

small, negative

(d)

small, positive

A complex has a molecular formula MSO₄Cl.6H₂O. The aqueous solution of it gives white precipitate with Barium chloride solution and no precipitate is obtained when it is treated with silver nitrate solution. If the secondary valence of the metal is six, which one of the following correctly represents the complex?

(a)

[M(H₂O)₄Cl]SO₄.2H₂O

(b)

[M(H₂O)₆]SO₄

(c)

[M(H₂O)₅Cl]SO₄.H₂O

(d)

[M(H₂O)₃Cl]SO₄.3H₂O

Which one of the following complexes is not expected to exhibit isomerism?

(a)

[Ni(NH₃)₄(H₂O)₂]²⁺

(b)

[Pt(NH₃)₂Cl₂]

(c)

[Co(NH₃)₅SO₄]Cl

(d)

[FeCl₆]^3-

Co-ordination isomerism is exhibited by _______.

(a)

[Cr(en)₂Cl₂]NO₂

(b)

[Pt(NH₃)₄] [CuCl₄]

(c)

[Cr(en)₂Cl₂]NO

(d)

[Co(NH₃)₅Cl]Cl₂

Which of the following is wrong about double salts?

(a)

retain their properties only in solid state

(b)

contains two or more salt in stoichiometric proportions

(c)

they don't dissociate into its constituent ions

(d)

none of the above

_______ valencies are directional in nature.

(a)

primary

(b)

secondary

(c)

teriary

(d)

None

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 ________.

(a)

\(\left( \frac { 1 }{ 2 } a;\frac { \sqrt { 3 } }{ 2 } a;\frac { \sqrt { 2 } }{ 2 } a \right) \)

(b)

\(\left( \sqrt { 1a } :\sqrt { 3a } :\sqrt { 2a } \right) \)

(c)

\(\left( \frac { 1 }{ 2 } a:\frac { \sqrt { 3 } }{ 4 } a:\frac { 1 }{ 2\sqrt { 2 } } a \right) \)

(d)

\(\frac { 1 }{ 2 } a:\sqrt { 3 } a:\frac { 1 }{ \sqrt { 2 } } a\)

Assertion: due to Frenkel defect, density of the crystalline solid decreases.
Reason: In Frenkel defect cation and anion leaves the crystal.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

(a)

Both assertion and reason are true and reason is the correct explanation of assertion

(b)

Both assertion and reason are true but reason is not the correct explanation of assertion

(c)

Assertion is true but reason is false

(d)

Both assertion and reason are false

Pick out the example for covalent and molecular crystal.

(a)

Ice, Diamond

(b)

Diamond, Ice

(c)

NaCl, FeS

(d)

FeS, Ice

Which one of the following is a network solid?

(a)

diamond

(b)

silicon carbide

(c)

naphthalene

(d)

both (a) and (b)

The coordination number of a metal crystallising in a hexagonal close packed structure is _______.

(a)

6

(b)

4

(c)

8

(d)

12

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.

(a)

001. e^−x

(b)

1 x 10^-2(1-e^-60x)

(c)

(1 x 10^-2)e^-60x

(d)

none of these

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

(a)

rate is proportional to the surface coverage

(b)

rate is inversely proportional to the surface coverage

(c)

rate is independent of the surface coverage

(d)

rate of decomposition is slow

What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?

(a)

534 kJ mol^-1

(b)

53.4 kJ mol^-1

(c)

5.34 kJ mol^-1

(d)

None of these

Which of the following does not affect the rate of reaction?

(a)

Amount of the reactant taken

(b)

Physical state of the reactant

(c)

∆H of reaction

(d)

Size of vessel

The excess energy which a molecule must possess to become active is known as  _____.

(a)

kinetic energy

(b)

threshold energy

(c)

potential energy

(d)

activation energy

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

(a)

2.42 × 10^-8mol³L^-3

(b)

2.66 × 10^-12mol³L^-3

(c)

4.5 × 10^-11mol³L^-3

(d)

5.619 × 10^-12mol³L^-3

Which will make basic buffer?

(a)

50 mL of 0.1M NaOH+25mL of 0.1M CH₃COOH

(b)

100 mL of 0.1M CH₃COOH+100 mL of 0.1M NH₄OH

(c)

100 mL of 0.1M HCl+200 mL of 0.1M NH₄OH

(d)

100 mL of 0.1M HCl+100 mL of 0.1M NaOH

For two acids A and B, K_a values at 25°C are 2 x 10⁶ and 1.8 x 10^-4 respectively. which among the following is true with respect to the above data _______.

(a)

A and B are equally acidic

(b)

A is stronger than B

(c)

B is stronger than A

(d)

K_a value is not a measure of acid strength

The degree of hydrolysis of 0.1 M solution of ammonium acetate is 8.48 x 10^-5. The dissociation constant of the weak base is _______.

(a)

1.39 x 10^-4

(b)

1.39 x 10^-5

(c)

1.45 x 10^-10

(d)

1.45 x 10^-9

In the complex, between boron tri fluoride and ammonia BF₃ ⇽NH₃, BF₃ is ________.

(a)

elodron deficient

(b)

electron pair donor

(c)

Lewis acid

(d)

elodron deficient and Lewis acid

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

(a)

Zinc is lighter than iron

(b)

Zinc has lower melting point than iron

(c)

Zinc has lower negative electrode potential than iron

(d)

Zinc has higher negative electrode potential than iron

Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below:
\({ BrO }_{ 4 }^{ - }\overset { 1.82V }{ \longrightarrow } { BrO }_{ 3 }^{ - }\overset { 1.5V }{ \longrightarrow } HBrO\overset { 1.595v }{ \longrightarrow } { Br }_{ 2 }\overset { 1.0652V }{ \longrightarrow } Br^{ - }\)
Then the species undergoing disproportional is

(a)

Br₂

(b)

BrO₄^-

(c)

BrO^-₃

(d)

HBrO

What is/are the factor(s) that govern the single electrode potential of a half cell?

(a)

concentration of ions in solution

(b)

tendency to form ions

(c)

temperature

(d)

all of these

What will be the equilibrium constant for the reaction between AgNO₃ and metallic Z_n, where E^o_cell = 1.56V?

(a)

6.19 x 10⁵²

(b)

619 x 10⁵²

(c)

0.619 x 10²⁵

(d)

6.19 x 10²⁵

The maximum work that can be derived from a chemical reaction is ______.

(a)

W_max = ΔH

(b)

W_max = ΔG

(c)

W_max = ΔE

(d)

W_max = ΔS

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below
(I) (NaCl) = 52
(II) ((BaCl₂) = 0.69
(III) (MgSO₄) = 0.22
The correct order of their coagulating power is ________.

(a)

III > II > I

(b)

I > II > III

(c)

I > III > II

(d)

II > III > I

If x is the amount of adsorb ate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

(a)

x/m = f(P) at constant T

(b)

x/m = f(T) at constant P

(c)

P = f(T) at constant x/m

(d)

x/m = PT

Oil soluble dye is mixed with emulsion and emulsion remains colourless then, the emulsion is _______.

(a)

O/W

(b)

W/O

(c)

O/O

(d)

W/W

Colloids are purified by _______.

(a)

precipitation

(b)

coagulation

(c)

dialysis

(d)

filtration

Peptisation is not used to prepare _______.

(a)

silverchloridesol

(b)

ferric hydroxide sol

(c)

both (a) and (b)

(d)

colloidal platinum

Among the following ethers which one will produce methyl alcohol on treatment with hot HI?

(a)

(H₃C)₃C-O-CH₃

(b)

(CH₃-)₂-CH-CH₂-O-CH₃

(c)

CH₃-(CH₂)₃-O-CH₃

(d)

CH₃-CH₂-\(\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } \)-O-CH₃

On reacting with neutral ferric chloride, phenol gives  ______.

(a)

red colour

(b)

violet colour

(c)

dark green colour

(d)

no colouration.

On oxidation of an alcohol gives an aldehyde having the same number of cabon atoms as that of alcohol is ________. 

(a)

1⁰ alcohol

(b)

2⁰ alcohol

(c)

3⁰ alcohol

(d)

None

The test used to distinguish wish 1^o, 2^o and 3^o alcohol is ________.

(a)

Lucas test

(b)

Victor Meyer's

(c)

dehydrogenation

(d)

all the above

The IUPAC name of phenetole is _______.

(a)

ethoxybenzene

(b)

methyl phenyl ether

(c)

diethyl ether

(d)

diphenyl ether

Identify the product formed in the reaction

(a)

(b)

(c)

(d)

Assertion: p – N, N – dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (-CHO) group is meta directing.
Codes:
A) if both assertion and reason are true and reason is the correct explanation of assertion.
B) if both assertion and reason are true but reason is not the correct explanation of assertion.
C) assertion is true but reason is false
D) both assertion and reason are false

(a)

if both assertion and reason are true and reason is the correct explanation of assertion.

(b)

if both assertion and reason are true but reason is not the correct explanation of assertion.

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

Aldehydes may be distinguished from ketones by the use of _______.

(a)

conc. H₂SO₄

(b)

Fehling's solution

(c)

pyrogallol

(d)

Lucas reagent

Which of the following compounds will react with NaHCO₃ solution to give sodium salt and CO₂?

(a)

Acetic acid

(b)

n-Hexanol

(c)

Phenol

(d)

Both (A) and (c)

Benzoic acid, when heated with soda lime gives _________.

(a)

C₆H₅COONa

(b)

C₆H₅COOC₆H₅

(c)

C₆H₆

(d)

C₆H₅OH

What are the differences between minerals and ores?

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

List out the commercial uses of iron.

Give reason : Extraction of copper directly from sulphide ores is less favourable than from its oxide ores through reduction.

Write a note on Fisher tropsch synthesis.

Give the structure of CO and CO₂.

Explain the formation of boron trifluoride.

What happens to CO₂ when dissolved in water?

What are interhalogen compounds? Give examples.

Why fluorine is more reactive than other halogens?

How would you account for the following? The electron gain enthalpy with negative sign is less for oxygen than that of sulphur.

Give reason for the following:
F₂ is more reactive than CIF₃ but CIF₃ is more reactive than Cl₂

Explain the oxidation states of 4d series elements.

Justify the position of lanthanoids and actinoids in the periodic table.

Orange colour of Cr₂O₇^2- ion charges to yellow in alkali and yellow solution turns out orange on adding H⁺ ions. Explain why?

What are the conditions for alloy formation?

Write the IUPAC names for the following complexes.

[CuCl₄]^2- exists while [Cul₄]^2- does not exist why?

What is a central atom or ion?

Draw the Cis and trans isomer of MA₂B₂ type

Name the seven primitive crystal systems.

A compound forms hexagonal dosed packed structure. What is the total number of voids in 0.5 mol of it? How many of these are tetrahedral voids?

Describe the graphical representation of first order reaction.

The decomposition reaction of ammonia gas on platinum surface has a rate constant R = 2.5 x 10^-4mol L^-1. What is the order of the reaction.

Answer the following:
(i) Effect the adding catalyst on activation energy and Gibb's energy (ΔG).
(ii) Why do we heat the solution of oxalic acid in redox tetration against KMnO₄?

The rate of the reaction X + 2y→ product is 4 x 10^-3 mol L^-1S^-1, if [X] = [Y] = 0.2M and rate constant at 400K is 2 x 10^-2s^-1, What is the overall order of the reaction.

Define solubility product.

Calculate the concentration of OH^- in a fruit juice which contains \(2\times10^{-3}\) M, H₃O⁺ ion. Identify the nature of the solution.

Magnesium is not precipitated from a solution of its salt by a mixture of NH₄OH and NH₄Cl. Explain

Calculate the ionisation constant for the conjugate base of HF. Ionisation constant of HF at 298 K is 6.8 x 10^-4

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

A conductivity cell has two platinum electrodes separated by a distance 1.5 cm and the cross sectional area of each electrode is 4.5 sq cm. Using this cell, the resistance of 0.5 N electrolytic solution was measured as 15 Ω. Find the specific conductance of the solution.

What is the value of Faraday constant? Define it.

Write the oxidation, reduction and overall redox reaction taking place in the Lithium ion battery.

Define Deemulsification.

Name the factors that affect adsorption.

Explain 'esterification' reaction with an example.

What happens when ethylene reacts with alkaline KMnO₄ solution?

Ethanal is more reactive towards nucleophilic addition reaction than propanone. Why?

Name a chemical test to distinguish between the following.
(i) 2-Pentanone, 3- Pentanone
(ii) Acetone, acetaldehyde
(iii) Benzaldehyde, butanal

Give the uses of zinc.

How is acid leaching done for the sulphide ores?

Complete the following reactions.
a. \(B(OH)_3 + NH_3\longrightarrow \)
b. \(Na_{ 2 }B_{ 4 }{ O }_{ 7 }+{ { H }_{ 2 }{ SO }_{ 4 }+{ 5H }_{ 2 }O\longrightarrow }\)
c. \({ B }_{ 2 }{ H }_{ 6 }+2NaOH+2{ H }_{ 2 }O\longrightarrow \)
d. \({ B }_{ 2 }{ H }_{ 6 }+6{ CH }_{ 3 }OH\longrightarrow \)
e. \(4{ BF }_{ 3 }+3{ H }_{ 2 }O\longrightarrow \)
f. \(HCOOH+{ H }_{ 2 }{ SO }_{ 4 }\longrightarrow \)
g. \(2SiCl_{ 4 }+NH\)₃
h. SiCl₄ + 4C₂H₅OH \(\rightarrow\)
i. 2\(B+6NaOH\longrightarrow \)
j. \({ H }_{ 2 }{ B }_{ 4 }{ O }_{ 7 }\overset { Red\ hot }{ \rightarrow } \)

How is boron trifluoride obtained from boron trioxide?

Write the valence shell electronic configuration of group-15 elements.

Complete the following reactions
(l) Cl₂+ H₂O\(\longrightarrow \)?
(ii) XeF₆ + 2H₂O \(\longrightarrow \) ?
(Iii) XeF₆ + 2H₂O\(\longrightarrow \)?

Compare lanthanoids and actinoids.

What happens to KMnO₄ when it reacts with
(i) Cold Cone. H₂SO₄
(ii) hot Cone H₂SO₄?

Write the postulates of Werner’s theory.

Match the common name with formula and the IUPAC ligand name.

Common name	Formula	IUPAC ligand name
Bromide	C2O42-	Carbonato
Nitrate	Br-	Oxalato
hydroxide	NO3-	hydroxido
Carbonate	OH-	bromido
Oxalate	CO32-	nitrato

How do the spacings of the three planes (100), (101) and (111) of simple cubic lattice vary?

The rate of formation of a dimer in a second order reaction is 7.5 x 10^-3 mol L^-1 s^-1 at 0.05 mol L^-1 monomer concentration. Calculate the rate constant.

A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is
(i) doubled (ii) reduced to half

Explain common ion effect with an example.

How will you calculate solubility product from molar solubility?

Reduction potential of two metals M₁ and M₂ are \(E^{0}_{M^{2+}_{1}|M_{1}} = -2.3V\) and \(E^{0}_{M^{2+}_{1}|M_{1}} = 0.2V\) Predict which one is better for coating the surface of iron. Given : \(\mathrm{E}_{\mathrm{Fe}^{2+} \mid \mathrm{Fe}}^{\circ}=-0.44 \mathrm{~V}\)

What are the types of changes in the cathode and anode in electrolytic and electrochemical cells?

What are enzymes? Write a brief note on the mechanism of enzyme catalysis.

How are colloidal solution of ink and graphite prepared?

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

How can the following conversion be effected? (i) Phenol to phenolphthalein.

What is Rosenmund's reduction? What is the purpose of adding BaSO₄ in it?

Explain refining of nickel by mond's process

How are silicates classified? Give an example for each type of silicate.

Give a detailed account on allotropes of sulphur.

Justify the following statement.
"Elements of the first transition series possess many properties different from those of heavier transition elements".

Mention the type of hybridisation and magnetic property of the following complexes using VB theory a) [FeF₆]^4- b) [Fe(CN)₆]^4-

Explain the following: Similarities and differences between metallic and ionic crystals.

The decomposition of NH₃ on platinum surface is zero reaction. What are the rate of production of N₂ and H₂ it K = 2.5 x 10^-4mol L^-1 S^-1?

If a solution has a pH of 7.41, determine its H⁺ concentration.

A zinc rod is placed in 0.095 M zinc chloride solution at 25^oC. Emf of this half cell is -0.79 V. Calculate E^o_Zn2+/Zn

Explain the electrical property of colloids with a neat diagram. (or) Write a note on Helmholta electrical double layer.

An organic compound A of molecular formula C₃H₆O on reduction with LiAlH₄ gives B. Compound B gives blue colour in Victor Meyer's test and also forms a chloride C with SOCl₂. The chloride on treatment with alcoholic KOH gives D. Identify A, B, C and D and explain the reactions.

Compound A with molecular formula C₇H₆O reduces Tollen's reagent and also gives Cannizaro reaction. A on oxidation gives the compound B with molecular formula C₇H₆O₂ Calcium salt of B on dry distillation gives the compound C with molecular formula C_I3H₁₀O. Find A, B and C. Explain the reaction.