Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

(a)

\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS₂ and H₂S

(b)

\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

(c)

Roasting of the sulphide to its oxide is thermodynamically feasible

(d)

Carbon and hydrogen are suitable reducing agents for metal sulphides

Electrochemical process is used to extract_______.

(a)

Iron

(b)

Lead

(c)

Sodium

(d)

silver

Cinnabar is the sulphide ore of_________metal.

(a)

Zn

(b)

Pb

(c)

Hg

(d)

Ag

The element that does not show catenation among the following p-block elements is ________.

(a)

Carbon

(b)

silicon

(c)

Lead

(d)

germanium

In the brown ring test, brown colour of the ring is due to _______.

(a)

a mixture of No and NO₂

(b)

Nitroso ferrous sulphate

(c)

Ferrous nitrate

(d)

Ferric nitra

The magnetic moment of Mn²⁺ ion is _______.

(a)

5.92BM

(b)

2.80BM

(c)

8.95BM

(d)

3.90BM

A magnetic moment of 1.73BM will be shown by one among the following.

(a)

TiCl₄

(b)

[CoCl₆]^4-

(c)

[Cu(NH₃)₄]²⁺

(d)

[Ni(CN)₄]^2-

The number of carbon atoms per unit cell of diamond is _______.

(a)

8

(b)

6

(c)

1

(d)

4

For a first order reaction A ⟶ product with initial concentration x mol L^-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is

(a)

(2.5 x 2) hours

(b)

\(\left( \frac { 2.5 }{ 2 } \right) \) hours

(c)

2.5 hours

(d)

Without knowing the rate constant, t_1/2 cannot be determined from the given data

While charging lead storage battery _______.

(a)

PbSO₄ on cathode is reduced to Pb

(b)

PbSO₄ on anode is oxidised to PbO₂

(c)

PbSO₄ on anode is reduced to Pb

(d)

PbSO₄ on cathode is oxidised to Pb

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 acid that cannot be prepared by Grignard reagent _______.

(a)

acetic acid

(b)

formic acid

(c)

butyric acid

(d)

benzoic acid

Which of the following reaction is not correct.

(a)

CH₃ CH₂ NH₂ \(\overset { { HNO }_{ 2 } }{ \longrightarrow } \)CH₃CH₂ OH + N₂ 

(b)

(c)

CH₂ CONH₂ \(\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } \)CH₃ NH₂

(d)

none of these

The above structure represents

(a)

Vitamin B₁₂

(b)

Vitamine B₆

(c)

dopamine

(d)

Histamine

Which among the following exists as zwitter ion?

(a)

sulphanilic acid

(b)

salicylic acid

(c)

acetanilide

(d)

all the above

Which gives an yellow oil with nitrous acid?

(a)

1° amine

(b)

2° amine

(c)

3° amine

(d)

quarternary salt

Which of the following nitro-compounds behave as an acid in the presence of strong alkali?

(a)

Primary

(b)

Secondary

(c)

Tertiary

(d)

Primary and Secondary

Oil of mirbane is ________

(a)

nitrobenzene

(b)

benzaldehyde

(c)

methyl salicylate

(d)

aspirin

Two amino acids say A, B react to give

(a)

two dipeptides

(b)

three dipeptides

(c)

four dipeptides

(d)

only one

Fructose on reduction with HI/P gives

(a)

n-hexane

(b)

iso-hexane

(c)

1⁰ alcohol

(d)

no reaction

The ultimate product of hydrolysis of starch in the presence of dilute acid is

(a)

dextrin

(b)

maltose

(c)

maltase

(d)

glucose

The disaccharide found in milk of mammals and referred as milk sugar is________

(a)

Lactose

(b)

Engthrose

(c)

Galactose

(d)

Erythrulose

The general formula of carbohydrates is_____

(a)

Cn(H₂O)

(b)

C_n(H₂O)

(c)

C(H₂O)_n

(d)

H(CO₂)

Amino acids are bifunctional containing ________ group.

(a)

CHO and COOH

(b)

OH and COOH

(c)

NH₂ and COOH

(d)

NO₂ and COOH

The sugar unit present in nucleic acid is___________

(a)

a hexose

(b)

tetrose

(c)

pentose

(d)

glucose