Extraction of gold and silver involves leaching with cyanide ion. silver is later recovered by_______.

(a)

Distillation

(b)

Zone refining

(c)

Displacement with zinc

(d)

liquation

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

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

Assertion: Rate of reaction doubles when the concentration of the reactant is doubles if it is a first order reaction.
Reason: Rate constant also doubles
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.

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

Buffer index is _______.

(a)

\(\beta =\frac { dB }{ p{ K }_{ a } } \)

(b)

\(\beta =\frac { dB }{ d(pH) } \)

(c)

\(\beta =\frac { dB }{ pH } \)

(d)

\(\beta =\frac { dB }{ pOH } \)

Fog is a colloidal solution of _______.

(a)

gas in liquid

(b)

liquid in gas

(c)

gas in solid

(d)

solid in gas

Ethylene diamine is converted to ethylene glycol using ______.

(a)

Na₂CO₃ solution

(b)

Nitrous acid

(c)

NaHCO₃ (aqueous)

(d)

Baeyer's reagent

It has no α- hydrogen ______.

(a)

CH₃CH₂OH

(b)

CH₃- CH₂- CH₂- OH

(c)

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

(d)

\({ CH }_{ 2 }={ CH }_{ 2 }\overset { i){ O }_{ 3 } }{ \underset { zn/{ H }_{ 2 }O }{ \longrightarrow } } X\overset { { NH }_{ 3 } }{ \longrightarrow } Y \ 'Y'\) is _______.

(a)

Formaldelyde

(b)

di acetone ammonia

(c)

hexamethylene tetraamine

(d)

oxime

Identify the product formed in the reaction

(a)

(b)

(c)

(d)

Identify 'X'.

(a)

(b)

(c)

(d)

On dry distillation this gives acetophenone _______.

(a)

calcium benzoate

(b)

calcium acetate and calcium benzoate

(c)

calcium acetate

(d)

calcium acetate and calcium formate

In metal carbonyls, the oxidation state of the metal is _________.

(a)

0

(b)

+2

(c)

+4

(d)

+6

CH₃CH₂ Br \(\overset { aqNaOH }{ \underset { \Delta }{ \longrightarrow } } A\overset { { KMnO }_{ 4 }{ /H }^{ + } }{ \underset { \Delta }{ \longrightarrow } } B\overset { { NH }_{ 3 } }{ \underset { \Delta }{ \longrightarrow } } C\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } D\)  D' is________.

(a)

bromomethane

(b)

α - bromo sodium acetate

(c)

methanamine

(d)

acetamide

Denaturation does not involve

(a)

breaking up of H-bonding in proteins

(b)

the loss of biological action of enzyme

(c)

the loss of secondary structure

(d)

loss of primary structure of proteins

________is called animal starch.

(a)

cellulose

(b)

heparin

(c)

glycogen

(d)

hyaluronic acid

The number of asymmetric carbon atoms present in glucose is__________.

(a)

3

(b)

4

(c)

5

(d)

6

Sorbitol and Mannitol are________

(a)

isomers

(b)

polymers

(c)

polymers

(d)

dimers

Mental diseases like schizophrenia are treated using _______ drugs.

(a)

tranquilizers

(b)

antacid

(c)

opioids

(d)

NSAID

The free radical polymerisation of the monomer 2 - chloro buta - l,3-diene gives _______________.

(a)

Buna N

(b)

Buna S

(c)

Neoprene

(d)

PHB

Proteins which act as biological catalysts are called ________

(a)

enzymes

(b)

hormones

(c)

vitamins

(d)

polymers

______ drugs are used in birth control pills.

(a)

Antihistamine

(b)

fertility

(c)

Antifertility

(d)

aminoglycosides

Which of the following is not an anesthetics?

(a)

nitrous oxide

(b)

chloroform

(c)

ether

(d)

novalgin

Nylon 6, 6 is a _______

(a)

polyester

(b)

polyamide

(c)

formaldehyde resin

(d)

polyalkene