In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with________.

(a)

Iron sulphide (FeS)

(b)

Carbon monoxide (CO)

(c)

Copper (I) sulphide (Cu₂S)

(d)

Sulphur dioxide (SO₂)

Sulphide ore is converted to oxide form by using the process________.

(a)

Calcination

(b)

Roasting

(c)

Smelting

(d)

Leavhing

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

On moving down the group 13, density ______

(a)

decreases

(b)

increases

(c)

First decreases then increases

(d)

remains same

Which of the following halides of group 15 is not hydrolysed?

(a)

NF₃

(b)

PF₃

(c)

NI₃

(d)

Both (a) and (b)

Pick the wrong one among the following

(a)

F₂ - Yellow

(b)

Br₂ - Red

(c)

Cl₂ - Colourless

(d)

I₂- Violet

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

(a)

Decrease in ionic radii

(b)

Increase in tendency to act as reducing agents

(c)

Decrease in basic character

(d)

Resembles second and third row of d-block elements

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.

(a)

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

(b)

Ce⁴⁺ and Yb²⁺ acquire f⁰ configuration

(c)

Ce⁴⁺ and Yb²⁺acquire f⁷ and f¹⁴ configuration

(d)

Ce⁴⁺and Yb²⁺ acquire f⁰ and f¹⁴ configuration

The general electronic configuration of d-block elements can be written as ________.

(a)

[Noble gas]n - 1d^1-10 ns^1-2

(b)

[Noble gas]n - 1d^-10 n^1-6

(c)

[Noble gas]n - 2 d¹⁰ ns^1-2

(d)

[Noble gas]n - 2 d¹⁰ ns^1-6

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

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

According to CFT, five d-orbitals of an octahedral complex split to give _______.

(a)

One orbital with lower energy and four orbitals with higher energy

(b)

Two orbitals with lower energy and three orbitals with higher energy

(c)

Three orbitals with lower energy and two orbitals with higher energy

(d)

Four orbitals with lower energy and one orbital with higher energy.

Which is not an anionic complex?

(a)

[Cu(NH₃)₄]Cl₂

(b)

K₄[Fe(CN)₆]

(c)

K₃[Fe(CN)₆]

(d)

[NiCl₄]^2-

In co-ordination complexes, ligand ammonia is written as _______.

(a)

ammine

(b)

amine

(c)

ammonal

(d)

none of these

The structure of hexaaquatitanium (III) ion is _______.

(a)

[Ti(H₂O)₆]³⁺

(b)

[Ti(H₂O)₆]^3-

(c)

[Ti(H₂O)₅]H₂O

(d)

[Ti(H₂O)₆]

A solid with formula ABC₃ would probably have, _______.

(a)

A at body centre, B at face centres and C at corners of the cube

(b)

A at corners of cube, B at body centre, C at face centre

(c)

A at corners of hexagon, B at centres of the hexagon and C inside the hexagonal unit cell

(d)

A at corner, B at face centre, C at body centre

If 'a' is the length of unit cell, then which one is correct relationship?

(a)

For simple cubic lattice, radius of metal atom =\(\frac{a}{2}\)

(b)

For bee lattice, radius of metal atom \(=\frac { \sqrt { 3a } }{ 4 } \)

(c)

For fcc lattice, radius of metal atom \(=\frac { a }{ 2\sqrt { 2 } } \)

(d)

All of these

An element with atomic mass 60 having fee structure has a density of 6.23g/cm³. What is the edge length of unit cell?

(a)

200 Pm

(b)

300 Pm

(c)

400 Pm

(d)

500 Pm

An excess of potassium ion makes KCl crystals appear violet since _______.

(a)

Some of anionic sites are occupied by unpaired electron

(b)

Anionic sites are occupied by pair of electrons

(c)

both (a) and (b)

(d)

neither (a) nor (b)

The coordination number of Zn in ZnO and Zn in ZnS are respectively________.

(a)

4 and 6

(b)

4 and 4

(c)

2 and 4

(d)

4 and 3

The number of chloride ions that surrounds the central Na ion in NaCl crystal is_______.

(a)

12

(b)

8

(c)

6

(d)

4

If electrical conductivity is found to be same in all directions through a solid the substance is ________ solid and the property is called _________.

(a)

crystalline, isotropy

(b)

amorphous, isotropy

(c)

crystalline, anisotropy

(d)

amorphous, isotropy

What would be the rate of disappearance of oxygen, if the rate of formation of nitric oxide (NO) is 3.6 x 10^-3mol L^-1 s^-1?

(a)

4 x 10^-3mol L^-1s^-1

(b)

4 x 10^-3mol^-1 L^-1s^-1

(c)

4.5 x 10^-3mol L^-1s^-1

(d)

4.5 x 10^-3mol^-1 L^-1s^-1

A+B \(\longrightarrow \) C; ∆H = 60 kJ mol^-1 Ea_f = 150 kJ. What is the activation energy of the backward reaction?

(a)

210 kJ

(b)

105 kJ

(c)

90 kJ

(d)

145 kJ

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

What will be the rate constant of a order reaction if its half life is given to be 20 min?

(a)

13.86 min^-1

(b)

28.86 min^-1

(c)

3.47 x 10^-2 min^-1

(d)

None of these

The unit of zero order rate constant is  _____.

(a)

litre mol^-1 sec^-1

(b)

mol litre^-1 sec^-1

(c)

sec^-1

(d)

litre² sec^-1

The value of rate constant of a pseudo first order reaction______.

(a)

Independent on the concentration of reactants present in small amount

(b)

Depends on the concentration of reactants present in excess

(c)

Independent of the concentration of reactants

(d)

Depends only on temperature.

The oxidation of potassium iodide by potassium persulphate as per the rate law, rate k[K₂S₂O₈] [K1]. The order with respect to potassium iodide is, _______.

(a)

two

(b)

one

(c)

three

(d)

four

In a second order reaction, if one of the concentration is excess, the order of the reaction is ________ order reaction.

(a)

first

(b)

pseudo first

(c)

third

(d)

zero

Analyses the equilibrium
HClO₄ +H₂O ⇌ H₃O+ \({ ClO }_{ 4 }^{ - }\)
and choose the correct statement.

(a)

H₃O⁺ is the conjugate base of H₂O

(b)

CIO₄^- is the conjugate base of HCIO₄

(c)

H₂O is the conjugate acid of H₃O⁺

(d)

HCIO₄ is the conjugate acid of H₃O⁺

Ionic product of water increases when _______.

(a)

Pressure decreases

(b)

H⁺ ions are added

(c)

OH^- ions are added

(d)

temperature increases

When sodium acetate is added to acetic acid, the degree of ionisation of acetic acid _______.

(a)

increases

(b)

decreases

(c)

dose not change

(d)

becomes zero

A drop of hydrochloric acid is added to pure water, its pH _____.

(a)

increases

(b)

decreases

(c)

increases and then decreases

(d)

resist the change in pH and so remains unaltered

Which among the following is the strongest reducing agent?

(a)

F₂

(b)

Cl₂

(c)

Zn

(d)

Li

Debye, Huckel and Onsager equation for strong electrolytes is λ_c = λ_∞ (A + Bλ_∞) \(\sqrt C\). The slope value is ______.

(a)

λ_∞

(b)

(A + Bλ_∞) 

(c)

A

(d)

\(\sqrt C\)

The quantity of charge required to obtain 1 mole of aluminum from Al₂O₃ is ______.

(a)

2F

(b)

3F

(c)

6F

(d)

12F

Low molar conductivity at high concentration is due to _______.

(a)

High attractive force between oppositively charged ions

(b)

Viscous drag due to greater solvation

(c)

Both High attractive force between oppositively charged ions and Viscous drag due to greater solvation

(d)

Neither High attractive force between oppositively charged ions and Viscous drag due to greater solvation

Which among the following does not affect adsorption?

(a)

surface area of the adsorbent

(b)

catalyst

(c)

temperature

(d)

pressure

The multilayer adsorption of gases on solids take place in _______.

(a)

physical adsorption

(b)

chemisorption

(c)

sols

(d)

active centres

For W/O emulsion, the principle emulsifying agent is _______.

(a)

proteins

(b)

synthetic soaps

(c)

lampblack

(d)

gums

The oxidation of sodium sulphite by air is retarded by _______.

(a)

MnO₂

(b)

H₂S

(c)

Alcohol

(d)

AS₂O₃

An example of Gel is_______.

(a)

sharing cream

(b)

paints

(c)

butter

(d)

whippedcream

The colloid used for stomach disorder is_______.

(a)

colloidal silver

(b)

colloidal antimony

(c)

colloidal gold

(d)

milk of magnesia

Which is optically active?

(a)

n-butyl alcohol

(b)

isobutyl alcohol

(c)

2-butanol

(d)

t-butyl alcohol

Predict the structure of propane-1,2 diol ______.

(a)

CH₂ (OH) - CH₂CH₂OH

(b)

HOCH₂ - CH₂OH

(c)

CH₃CH (OH) CH₂OH

(d)

None of these

Glycerol when heated with cone. H₂SO₄ gives ______.

(a)

allyl alcohol

(b)

propyl alcohol

(c)

acrolein

(d)

propylene

The boiling point of ethyl alcohol should be less than that of _______.

(a)

propane

(b)

formic acid

(c)

dimethyl ether

(d)

none of the above

The alcohol obtained by the hydrolysis of oils and fats is _______.

(a)

pentanol

(b)

propanol

(c)

glycerol

(d)

glycol

The ultimate product obtained when glycerol reacts with oxalic acid at 533K is ________.

(a)

formic acid

(b)

glycerol oxalate

(c)

allyl alcohol

(d)

acrolein

Oxidation of glycerol with bismuth nitrate gives ________.

(a)

meso-oxalic acid

(b)

glyceric acid

(c)

tartronic acid

(d)

both (b) and (c)

According to Lewis concept of acids and bases, ethers are _______.

(a)

neutral

(b)

acidic

(c)

basic

(d)

amphoteric

Metamerism is exhibited by _______.

(a)

hydrocarbon

(b)

nitro compounds

(c)

mineral acid

(d)

ether

The number of possible isomers for molecular formula C₃H₈O is _______.

(a)

2

(b)

3

(c)

7

(d)

4

On heating, peroxides are ________.

(a)

stable

(b)

unstable

(c)

decomposes violently

(d)

both (b) and (c)

Methyl ketones are usually characterised by _______.

(a)

the Fehling's solution

(b)

the iodoform test

(c)

the Schiff's test

(d)

the Tollen's reagent

The high boiling points of carboxylic acids is due to _______.

(a)

weak Vanderwaal's forces

(b)

intermolecular hydrogen bonding

(c)

intramolecular hydrogen bonding.

(d)

delocalisation of π electrons

Aldol is _________.

(a)

2-hydroxy butanol

(b)

3 -hydroxy butanol

(c)

3- hydroxy butanal

(d)

2 -hydroxy butanal

Glucose reacts with acetic anhydride in the presence of pyridine to give

(a)

monoacetate

(b)

diacetate

(c)

penta acetate

(d)

no reaction

On hydrolysis, which one of the following disaccharide will give a ketose and an aldose?

(a)

Maltose

(b)

Sucrose

(c)

Lactose

(d)

All the above

Pyridoxine is__________

(a)

vitamin B₆

(b)

vitamin B₇

(c)

vitamin B₉

(d)

vitamin B₅

The properties of protein are determined by___________

(a)

nature of the amino acids

(b)

the position of NH₂ group

(c)

the position of COOH group

(d)

all

The helical structure of protein is stabilised by_________

(a)

peptide bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

Vanderwaals inter action

The class of drugs used for the treatment of stress is _______

(a)

antihistamine

(b)

tranquilizens

(c)

antimicrobials

(d)

aminoglycosides

_______ is used mainly as preservative for the preparation of pickles.

(a)

Sodium meta bisulphite

(b)

Potassiummaeta bisulphite

(c)

Benzoic acid

(d)

Acetic acid