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

(a)

Al

(b)

Ni

(c)

Cu

(d)

Zn

Zinc is obtained from ZnO by________.

(a)

Carbon reduction

(b)

Reduction using silver

(c)

Electrochemical process

(d)

Acid leaching

\({ Zn }_{ (s) }+2\left[ Au(CN)_{ 2 } \right] ^{ - }_{ (aq) }\longrightarrow \left[ Zn(CN)_{ 4 } \right] ^{ 2- }_{ (aq) }+2A{ { u }_{ (s) } }\) In the above equation the oxidation state of metallic gold is_______

(a)

1

(b)

0

(c)

+2

(d)

-2

Steel is an alloy of___________

(a)

iron and carbon

(b)

iron and calcium

(c)

copper and carbon

(d)

copper and iron

Galena is_______.

(a)

PbS

(b)

ZnS

(c)

Ag₂S

(d)

FeS₂

Which of the following metals has the largest abundance in the earth’s crust?

(a)

Aluminium

(b)

Calcium

(c)

Magnesium

(d)

Sodium

The compound that is used in nuclear reactors as protective shields and control rods is _________.

(a)

Metal borides

(b)

metal oxides

(c)

Metal carbonates

(d)

metal carbide

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

(a)

Boron nitride

(b)

Boron Carbide

(c)

Aluminium Carbide

(d)

Aluminium Oxide

Chemical formula of phosgene is_______.

(a)

COCl₂

(b)

CaOCl₂

(c)

CaCO₃

(d)

COCI

All elements except carbon have the tendency to show maximum covalency of six ______

(a)

due to presence of vacant d-orbitals

(b)

due to absence of vacant d-orbitals

(c)

due to presence of partially filled d-orbitals

(d)

due to presence of completely filled d-orbitals

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

(a)

6N

(b)

4N

(c)

2N

(d)

none of these

Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
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

Which is dibasic?

(a)

Orthophosphoric acid

(b)

Pyrophosphoric acid

(c)

Orthophosphorus acid

(d)

Hypophosphorus acid

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

The incorrect statement among the following is _________.

(a)

Reducing character of hydrides of group 15 increases down the group

(b)

Basicity of hydrides of group 15 increases down the group

(c)

NCl₅ does not exist

(d)

Phosphorus and arsenic can form P\(\pi \)-d\(\pi \) bond but not nitrogen

Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.

(a)

both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds

(b)

In case of Sc, 3d orbital are partially filled but in Zn these are completely filled

(c)

last electron as assumed to be added to 4s level in case of zinc

(d)

both Sc and Zn do not exhibit variable oxidation states

When a brown compound of Mn (A) is treated with HCl, it gives a gas (B). The gas (B) taken in excess reacts with NH₃ to give an explosive compound (C). The compound A, B and C are ________.

(a)

MnO₂, Cl₂, NCl₃

(b)

MnO, Cl₂, NH₄Cl

(c)

Mn₃O₄, Cl₂, NCl₃

(d)

MnO₃, Cl₂, NCl₂

The reaction of aqueous KMnO₄ with H₂O₂ in acidic condition gives_______.

(a)

Mn⁴⁺ and MnO₂

(b)

Mn⁴⁺ and O₂

(c)

Mn²⁺ and O₂

(d)

Mn²⁺ and O₃

Value of magnetic moment of a divalent metal ion is, 5.92 BM. Total number of electron in its atom would be _______.

(a)

24

(b)

25

(c)

26

(d)

27

_________ is known as Bayer's reagent.

(a)

Hot dilute alkaline KMnO₄

(b)

Cold dilute alkaline KMnO₄

(c)

Hot Conc. acidic KMnO₄

(d)

Cold Conc. acidic KMnO₄

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 pairs represents linkage isomers?

(a)

[Cu(NH₃)₄][PtCl₄] and [Pt(NH₃)₄][CuCl₄]

(b)

[Co(NH₃)₅(NO₃)]SO₄ and [Co(NH₃)₅(ONO)]

(c)

[Co(NH₃)₄(NCS)₂]Cl and [Co(NH₃)₄(SCN)₂]Cl

(d)

both (b) and (c)

The spin only magnetic moment of [Mnfsr₄]^2- is 5.9 BM. Geometry of the complex ion is _______.

(a)

Tetrahedral

(b)

Octahedral

(c)

Square planar

(d)

Pentagonal pyramidal

Consider the following statements and identify the incorrect statement(s).
(i) CN^- is a powerful ligand.
(ii) Haemoglobin is a monomer and myoglobin is a tetramer.
(iii) Cis - Pt (NH₃)₂Cl₂ is an anti-tumor drug.

(a)

only (i)

(b)

only (ii) 

(c)

only (iii)

(d)

both (i) and (iii) 

______is used as an antitumor drug in cancer treatment.

(a)

Ca - EDTA

(b)

Cis - platin

(c)

Sodium thio sulphate

(d)

Nickel chloride

Graphite and diamond are ________.

(a)

Covalent and molecular crystals

(b)

ionic and covalent crystals

(c)

both covalent crystals

(d)

both molecular crystals

In calcium fluoride, having the flurite structure the coordination number of Ca²⁺ ion and F^- Ion are ________.

(a)

4 and 2

(b)

6 and 6

(c)

8 and 4

(d)

4 and 8

Crystalline solids are also called as _______.

(a)

supercooled liquids

(b)

true solids

(c)

pseudo solids

(d)

all the above

In an hexagonal crystal _______.

(a)

a=b=c,∝ =β=૪=90°

(b)

a=b=c,∝ =β=૪≠90°

(c)

a=b≠c,∝ =β=૪=90°

(d)

a=b≠c,∝ =β=90°૪=120°

The force that binds a metal ion to a number of electrons within its sphere of influence is known as_________ bond.

(a)

covalent

(b)

ionic

(c)

metallic

(d)

co-ordinate

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

(a)

Enthalpy

(b)

Activation energy

(c)

Entropy

(d)

Internal energy

In a first order reaction x ⟶ y; if k is the rate constant and the initial concentration of the reactant x is 0.1M, then, the half life is_____.

(a)

\(\left( \frac { \log2 }{ k } \right) \)

(b)

\(\left( \frac { 0.693 }{ (0.1)k } \right) \)

(c)

\(\left( \frac { In2 }{ k } \right) \)

(d)

none of these

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.

(a)

4 x 10^-5mol L^-1s^-1

(b)

4.5 x 10^-1mol L^-1s^-1

(c)

3.6 x 10^-4 mol L^-1s^-1

(d)

None of these

During a chemical reaction, the concentration of reaction  _____.

(a)

increases

(b)

decreases

(c)

remains constant

(d)

first increases and then decreases

CH₃COOCH₃ + H₂ OH \(\overset { { H }^{ + } }{ \longrightarrow } \) CH₃ COOH + CH₃ OH is an example of _______ order reaction.

(a)

first

(b)

zero

(c)

third

(d)

pseudo

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

(a)

1.08 × 10^-14mol²L^-2

(b)

1.08 × 10^-12mol²L^-2

(c)

1.08 × 10^-10mol²L^-2

(d)

1.08 × 10^-8mol²L^-2

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

(a)

BF₃

(b)

PF₃

(c)

CO

(d)

F^–

The condition for a compound to be precipitated is _______.

(a)

Ionic product = solubility product

(b)

Ionic product < solubility product

(c)

Ionic product > solubility product

(d)

Ionic product ≤ solubility product

Which one of the following relationship is correct?

(a)

\(pH=\frac { 1 }{ [{ H }^{ + }] } \)

(b)

\(pH={ \log }_{ 10 }[{ H }^{ + }]\)

(c)

\({ \log }_{ 10 }pH=[{ H }^{ + }]\)

(d)

\(pH={ \log }_{ 10 }\frac { 1 }{ [{ H }^{ + }] } \)

According to ________ concept, BF₃ acts as a acid.

(a)

Bronsted

(b)

Arrhenius

(c)

Lewis

(d)

None of the above

Assertion: pure iron when heated in dry air is converted with a layer of rust.
Reason: Rust has the composition Fe₃ O₄
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

The equivalent conductance of M/36 solution of a weak monobasic acid is 6 mho cm² equivalent^-1 and at infinite dilution is 400 mho cm² equivalent^-1. The dissociation constant of this acid is ______.

(a)

1.25 x 10⁻⁶

(b)

6.25 x 10^-6

(c)

1.25 x 10⁻⁴

(d)

6.25 x 10 ^-5

Kohlraush's law is applied to calculate ________.

(a)

molar conductance at infinite dilution of a weak electrolyte

(b)

degree of dissociation of weak electrolyte

(c)

solubility of a sparingly soluble salt

(d)

all the above

The relationship between free energy change and emf of a cell is ______.

(a)

∆G = -nFE

(b)

∆H = -nF

(c)

∆E = -nFG

(d)

∆F = -nFG

The zinc - copper cell has emf of _______.

(a)

1V

(b)

2.1 V

(c)

1.1V

(d)

-1.1 V

Fog is colloidal solution of _______.

(a)

solid in gas

(b)

gas in gas

(c)

liquid in gas

(d)

gas in liquid

Which one of the is not a surfactant?

(a)

CH₃ -(CH₂)₁₅ -N⁺ -(CH₃)₂ CH₂Br

(b)

CH₃ -(CH₂)₁₅ -NH₂

(c)

CH₃ -(- CH₂- )-₁₆CH₂ OSO₂^- Na⁺

(d)

OHC-(CH₂)₁₄ -CH₂ -COO^- Na⁺

The phenomenon of scattering of light by the sol particles is called _______.

(a)

tyndall effect

(b)

electrophoresis

(c)

cataphoresis

(d)

dialysis

Emulsifying agent used for O/W  emulsion is: _______.

(a)

proteins

(b)

heavy metal salts of fatty acids

(c)

long chain alcohol

(d)

lamp black

The process of separation of emulsion into two separate layers is called ________.

(a)

Emulsification

(b)

Deemulsification

(c)

Coagulation

(d)

Flocculation

Assertion: Phenol is more reactive than benzene towards electrophilic substitution reaction
Reason: In the case of phenol, the intermediate arenium ion is more stabilized by resonance
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.

The reactions
 is an example of  ______.

(a)

Wurtz reaction

(b)

cyclic reaction

(c)

Williamson reaction

(d)

Kolbe reactions

Which one of the following has the highest boiling point?

(a)

CH₃CH₂CH₂CH₂CH₃

(b)

CH₃CH₂CH₂CH₂OH

(c)

CH₃CH₂CH₂CH₃

(d)

CH₃CH₂CH₂Cl

CH₃CH₂OH \(\underset { (O) }{ \longrightarrow } \) CH₃CHO  \(\underset { (O) }{ \longrightarrow } \) CH₃COOH To stop the oxidation reaction at the aldehyde stage, ______ is used as an oxidising agent.

(a)

KMnO₄ | H⁺

(b)

K₂Cr₂O₇ | H⁺

(c)

pyridinium chloro chromate

(d)

both (a) and (b)

Lower halogenated ethers can be converted into higher ethers by using _______ reagent.

(a)

Grignard

(b)

Tollen's

(c)

Fehling's

(d)

none of the above

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

(a)

Grignard reagent

(b)

Sn / HCl

(c)

hydrazine in presence of slightly acidic solution

(d)

hydrocyanic acid

Which one of the following reaction is an example of disproportionation reaction.

(a)

Aldol condensation

(b)

cannizaro reaction

(c)

Benzoin condensation

(d)

none of these

\(HCHO+{ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -{ CH }_{ 3 }\overset { dil }{ \underset { NaOH }{ \longrightarrow } } HO-{ CH }_{ 2 }-{ CH }_{ 2 }-\underset { \overset { || }{ \overset { O }{ } } }{ C } -{ CH }_{ 3 }\) is an example of _________ reaction.
                                                                                   4-hydroxy butan-2-one

(a)

Claisen Schmidt

(b)

Cannizaro

(c)

Aldol

(d)

Crossed aldol

Benzoin is _________.

(a)

an ∝ -hydroxy aldehyde

(b)

β- hydroxy aldehyde

(c)

β-hydroxy ketone

(d)

α - hydroxy ketone

Benzoic acid, when heated with soda lime gives _________.

(a)

C₆H₅COONa

(b)

C₆H₅COOC₆H₅

(c)

C₆H₆

(d)

C₆H₅OH

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

Describe a method for refining nickel. (or) Explain the Mond process of refining nickel.

Name some reducing agents used to convert Metal oxides to metal

What are the different methods of concentration of ores?

Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF₃.

Give the structure of CO and CO₂.

What is tetraethoxy silane? How is it obtained?

Among group 14 elements, name
(i) the most electro negative element
(ii) the most metallic element

Chalcogens belongs to p-block. Give reason.

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

How is nitrogen prepared from liquid air?

Give the reason for bleaching action of Cl₂.

What are transition metals? Give four examples.

Explain the oxidation states of 4d series elements.

(i) Name the element showing maximum number of oxidation states among the first series of transition, metals from Sc (Z= 21) to Zn (Z=30).
(ii) Name the element which shows only +3 oxidation state.

What is hydroformylation of olefins?

Write the IUPAC names for the following complexes.

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

Write the IUPAC name of [Cu(NH₃)₄]SO₄

Give the geometry and magnetic character of [NiCI₄]^2-

Why do solids have a definite volume?

A compound made up of two atoms X and Y has a face centred cubic arrangement. X is present in the coners and Y at the centre of each face. If one atom is missing from comer. What is the simplest formula of the compound.

Explain the rate determining step with an example.

Explain the effect of catalyst on reaction rate with an example.

Why is instantaneous rate preferred over average rate?

A first order reaction has a specific reaction rate of 10^-3 S^-1. How much time will it take for 10gm of the reactant to reduce to 2.5 gm?

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

Calculate the pH of 0.001M HCl 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

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

Describe the electrolysis of molten NaCl using inert electrodes

Name the anode, cathode and electrolyte used in lithium - ion Battery

Explain how iron is protected from corrosion by coating with magnesium.

What is the formula for Ziegler - Natta catalyst?

What are promoters? Give an example.

How will you convert of ethylene glycol to 1,4 - dioxane.

State Saytzeff's rule.

Acetone is soluble in water but benzophenone is not. Give reason.

Explain HVZ reaction.

Give the uses of zinc.

Write the chemical composition of the following alloys and give anyone of its application.
(i) Bronze
(ii) Brass
(iii) Stainless steelass

Write a short note on hydroboration.

How is aluminum chloride prepared from aluminum?

Write the reason for the anomalous behaviour of Nitrogen.

What is Haber's process?

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

Give reason for the following:
(i) A transition metal exhibits highest oxidation state in oxides and fluorides.
(ii) Cu²⁺ is unstable in an aqueous solution.

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

Draw the structures of geometrical isomers of [Fe(NH₃)₂ (CN)₄]^-

Inspite of long range order in the arrangement of particles, why are the crystals usually not perfect?

Hydrolysis of methyl acetate in aqueous solution has been studied by titrating the liberated acetic acid against sodium hydroxide. The concentration of an ester at different temperatures is given below.

t(min)	0	20	40	60	∝
v (ml)	20.2	25.6	29.5	32.8	50.4

Show that the reaction is the first order reactions.

The rate constant for a first order reaction is 60 S^-1. How much time will it take to reduce the initial concentration of the reactant to its \({ \frac { 1 }{ 16 } }^{ th }\) value?

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

Based on Arrhenius concept, defame acid and bases and give an example for each.

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%.

What is the oxidation and reduction half cell in a Daniel cell?

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

Define adsorption.

Explain the manufacture of glycerol from triglycerides,

Give the Grignard reagent and carbonyl compound that can be used to prepare.
(a) CH₃-CH₂-CH₂-OH
(b) (CH₃)₂C(OH)CH₂CH₂CH₃
(c) C₆H₅CH₂CH(OH)CH₃

Formaldehyde and benzaldehyde give Cannizaro reaction but acetaldehyde does not - account for this.

List the applications of iron.

What are the various methods by which carbon-di-oxide is prepared?

Explain the bleaching action of Chlorine.

Why is there a variation of atomic andionic size as we move from Sc to Zn?

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers.
(i) K[Cr(H₂O)₂ (C₂O₄)₂]
(ii) [Co(en)₃]CI₃
(iii) [Co(NH₃)₅(NO₂)](NO₃)₂
(iv) [Pt (NH₃)(H₂O)CI₂]

How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.

Reaction is first order in A and second in B.
(i) Write the different rate equation.
(ii) How is the rate affected on increasing the concentration of B three times?
(iii) How is the rate affected when the concentrations of both A and B are doubled?

A 0.02 M solution of a weak mono basic acid is 5% ionised. Calculate the ionisation constant of the acid.

Specific conductance of 1M KNO₃ solution is oberved to be 5.55 x 10^-3 mho cm². What is the equivalent conductance of KNO₃ when one litre of the solution is used?

Explain the factors affecting adsorption.

Distinguish between (a) Ethanol and phenol (b) Phenol and acetic acid (c) Phenol and aniline (d) Phenol and anisole.

An organic compound (A) with molecular formula C₃H₆O undergoes iodoform reaction. Two molecules of compound (A) react with dry HCI to give compound (B) (C₆H₁₀O). Compound (B) reacts with one more molecule of compound (A) to give compound (C) (C₉H₁₄O). Identify (A), (B) and (C). Explain the reactions.