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

(a)

Leaching

(b)

Roasting

(c)

Froth floatation

(d)

Both (a) and (c)

The basic structural unit of silicates is _______.

(a)

\(\left( SiO_{ 3 } \right) ^{ 2- }\)

(b)

\(\left( SiO_{ 4 } \right) ^{ 2- }\)

(c)

\(\left( Sio \right) ^{ - }\)

(d)

\(\left( SiO_{ 4 } \right) ^{ 4- }\)

Most easily liquefiable gas is _______.

(a)

Ar

(b)

Ne

(c)

He

(d)

Kr

Assertion: Ce⁴⁺ is used as an oxidizing agent in volumetric analysis.
Reason: Ce⁴⁺ has the tendency of attaining +3 oxidation state.
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 assert

(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.

The coordination number of Ni(II) in [Ni(CN)₄]^2- is _______.

(a)

2

(b)

4

(c)

5

(d)

0

The ionisation isomer of [Cr(H₂O)₄CI(NO₂)]Cl is _________.

(a)

[Cr(H₂O)₄Cl₂(NO)₂]

(b)

[Cr(H₂O)₄Cl₂]NO₂

(c)

[Cr(H₂O)₄Cl(ONO)]

(d)

both (a) and (b)

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

(a)

6.023 x 10²³

(b)

6.023 x 10²²

(c)

60.23 x 10²³

(d)

\(\left( \frac { 6.023\times { 10 }^{ 23 } }{ 8\times 40 } \right) \)

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 rate constant of a reaction is 5.8 x 10^-2  S^{​​​​​​-1} The order of the reaction is ______.

(a)

First order

(b)

zero order

(c)

Second order

(d)

Third order

In any unimolecular reaction  _____.

(a)

Only two reacting species is involved in the rate determining step.

(b)

The order and the molecularity of slowest step are equal to one.

(c)

The molecularity of the reaction is one and order is zero.

(d)

Both molecularity and order of the reaction are one.

A certain current liberated 0.504gm of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution ______.

(a)

31.75

(b)

15.8

(c)

7.5

(d)

63.5

λ_c = μ_c for, ______.

(a)

NaCI

(b)

H₂SO₄

(c)

Na₂SO₄

(d)

Al₂(SO₄)₃

A substance which destroys the activity of a catalyst is_______.

(a)

negative catalyst

(b)

catalytic poison

(c)

both (a) and (b)

(d)

promoter

Assertion: Phenol is more acidic than ethanol
Reason: Phenoxide ion is resonance stabilized
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)

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.

With concentrated sulphuric acid, glycol undergoes intermolecular dehydration to give cyclic compound ______.

(a)

diethylene glycol

(b)

dioxan

(c)

paraldehyde

(d)

glyoxal

Identify 'X'.

(a)

(b)

(c)

(d)

In Friedel Craft's reaction of benzoylation of benzene, which of the following acts as a electrophile?

(a)

CHCO⁺

(b)

CHO^-

(c)

CH₃CO⁺

(d)

CH₃CO^-

On Kolbe's electrolysis, formic acid gives _______.

(a)

H₂

(b)

methane

(c)

ethane

(d)

none

Reduction of RCHO to RCH₃ by N₂H₄ in C₂H₅ONa is _________ reaction.

(a)

Stephen reduction

(b)

Catalytic reduction

(c)

Clemmensen reduction

(d)

Wolff-kishner reduction

Which among the following reactions will not result in the formation of carbon - carbon bond?

(a)

Friedel Craft

(b)

Cannizaro reaction

(c)

Riemer - Tiemann

(d)

None of the above

Benzoic acid, when heated with soda lime gives _________.

(a)

C₆H₅COONa

(b)

C₆H₅COOC₆H₅

(c)

C₆H₆

(d)

C₆H₅OH

Complete the reaction \(\underset { \overset { | }{ { CH }_{ 3 }-CHOH } }{ { CH }_{ 3 }-CHOH } \overset { { HIO }_{ 4 } }{ \underset { ? }{ \longrightarrow } } X\) is _________.

(a)

CH₃COCH₃

(b)

CH₃CHO

(c)

C₆H₅CHO

(d)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } -CH-CHO\)

Identify X in the sequence give below

(a)

(b)

(c)

(d)

(CH₃)₂ - CH - NO when boiled with HCI/H₂O gives compound 'X'. Identify 'X'.

(a)

CH₃COOH

(b)

(CH₃)₂C = 0

(c)

CH₃CHO

(d)

CH₃NO₂