Chemical Process

Question: Addition of calcium oxide to water produces
[A].

exothermic heat

[B].

hissing sound

[C].

slaked lime

[D].

all (a), (b) & (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Favourable conditions for the liquefaction of gases in general are
[A].

high pressure & low temperature.

[B].

low pressure & high temperature.

[C].

high pressure & high temperature.

[D].

low pressure & low temperature.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cement setting under water employs a/an __________ process.
[A].

hydration

[B].

decomposition

[C].

oxidation

[D].

reduction

Answer: Option A

Explanation:

No answer description available for this question.

Question: Main constituents of portland cement are calcium aluminate and
[A].

gypsum

[B].

silicates

[C].

sodium silicate

[D].

carbonates

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ is used as a flux in the extraction of iron from iron ore (hametite) in blast furnace.
[A].

Bauxite

[B].

Limestone

[C].

Quartz

[D].

Manganese

Answer: Option B

Explanation:

No answer description available for this question.

Question: A mineral is termed as ‘ore’, if
[A].

a metal can be economically extracted from it.

[B].

it contains ≥ 40% metal.

[C].

the metal present in it is costly.

[D].

all (a), (b) and (c).

Answer: Option A

Explanation:

No answer description available for this question.

Question: Glass is
[A].

mainly CaO

[B].

subjected to galvanising

[C].

a super cooled liquid

[D].

all (a), (b) and (c)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Main constituent of dolomite is
[A].

CaCO3

[B].

MgCO3

[C].

K2CO3

[D].

Na2CO3

Answer: Option B

Explanation:

No answer description available for this question.

Question: Diaphragm electrolytic cell as compared to mercury electrolytic cell
[A].

produces 70% NaOH solution.

[B].

requires less specific power consumption for the production of chlorine.

[C].

requires lesser investment for similar capacity.

[D].

all (a), (b) and (c).

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ nature of hypo (sodium thiosulphate) makes it useful in photography.
[A].

Oxidising

[B].

Reducing

[C].

Complex forming

[D].

Photochemical

Answer: Option C

Explanation:

No answer description available for this question.