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

(a)

Leaching

(b)

Roasting

(c)

Froth floatation

(d)

Both (a) and (c)

In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

(a)

Non-wettability of the mineral particles in froth.

(b)

Non-wettability of the mineral particles in water

(c)

Non-wettability of the gangue particles in froth

(d)

Non-wettability of the gangue particles in water

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

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

(a)

1s² 2s² 2p⁴

(b)

1s² 2s² 2p³

(c)

1s² 2s² 2p⁶ 3s² 3p²

(d)

1s² 2s² 2p⁶ 3s² 3p³

Coinage metals are _______.

(a)

normal metals

(b)

transition metals

(c)

active metals

(d)

alkali metals

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

(a)

Coordination isomerism

(b)

Linkage isomerism

(c)

Optical isomerism

(d)

Geometrical isomerism

Identify the Co-ordination entity in the given complex [Co(NH₃)₄(H₂O)CI]CI₂

(a)

Cl₂

(b)

(NH₃)₄

(c)

[Co(NH₃)₄(H₂O)Cl]

(d)

(H₂O)

The crystal with a metal deficiency defect is ________.

(a)

NaCl

(b)

FeO

(c)

ZnO

(d)

KCl

A crystal which has the same unit cell and contains the same lattice points throughout the crystal is_________.

(a)

perfect

(b)

imperfect

(c)

distorted

(d)

both (b) and (c)

Predict the rate law of the following reaction based on the data given below 
2A+B⟶C+3D

Reaction number	[A] (min)	[B] (min)	Initial rate (M s-1)
1	0.1	0.1	x
2	0.2	0.1	2x
3	0.1	0.2	4x
4	0.2	0.2	8x

(a)

rate = k[A]² [B]

(b)

rate = k[A] [B]²

(c)

rate = k[A] [B]

(d)

rate = k[A]^1/2 [B]^3/2

For an exothermic chemical process occurring in 2 steps as
(i) A +B ⟶ X (slow) ;
(ii) X ⟶  AB (fast)
The progress of the reaction can be best described by (x- intermediate).

(a)

(b)

(c)

(d)

None of these

Which one of the following is an example of pseudo first order reaction?

(a)

Acid hydrolysis of ester

(b)

Decomposition of HI

(c)

Synthesis of NH₃

(d)

All radioactive transformations

Conjugate base for Bronsted acids H₂O and HF are _______.

(a)

OH^- and H₂FH⁺, respectively

(b)

H₃O⁺ and F^-, respectively

(c)

OH^- and F^-, respectively

(d)

H₃O⁺ and H₂F⁺, respectively

pH of 0.05M H₂SO₄ is _______.

(a)

1

(b)

2.6990

(c)

1.3010

(d)

1.6990

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

The reciprocal of specific resistance is called _______.

(a)

conductance

(b)

specific conductance

(c)

conductivity

(d)

both specific conductance and conductivity

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⁺

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

(a)

proteins

(b)

synthetic soaps

(c)

lampblack

(d)

gums

Brownian movement of colloidal particles is a ______ property.

(a)

Kinetic

(b)

Electrical

(c)

Optical

(d)

Magnetic

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 ______.

(a)

ethane

(b)

ethoxyethane

(c)

ethylbisulphite

(d)

ethanol

Which of the following gives violet colour with neutral ferric chloride solution?

(a)

phenol

(b)

glycerine

(c)

benzyl alcohol

(d)

ethanol

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

(a)

formic acid

(b)

glycerol oxalate

(c)

allyl alcohol

(d)

acrolein

Which among the following does not give haloform test?

(a)

CH₃CHO

(b)

CH₃COC₂H₅

(c)

CH₃CH₂COCH₂CH₃

(d)

CH₃CH₂COCH₃

Acetone reacting with HCN to form cyanohydrin is ________ type of reaction.

(a)

Nucleophilic addition

(b)

Electrophilic substitution

(c)

Freeradical substitution

(d)

Redox

CH₃CHO and C₆H₅CH₂CHO can be distinguished by ______.

(a)

Tollens reagent

(b)

Fehlings solution

(c)

Benedict

(d)

Iodoform test