Chemical Engineering

Question: Permanent hardness of water can be removed by
[A].

simply boiling.

[B].

adding alum.

[C].

passing it through cation & anion exchangers.

[D].

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

Answer: Option C

Explanation:

No answer description available for this question.

Question: Most widely and commonly used coagulant for the removal of suspended impurities in water is
[A].

bleaching powder

[B].

slaked lime

[C].

alum

[D].

copper sulphate

Answer: Option C

Explanation:

No answer description available for this question.

Question: Oils and fats are converted to soap in a process called
[A].

hydrogenation

[B].

esterification

[C].

saponification

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its
[A].

poor oxidation stability and high gum forming tendency.

[B].

greater tendency of decomposition at elevated temperature.

[C].

hydrolysis tendency in presence of water.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used
[A].

as a lubricant.

[B].

as a rust preventive.

[C].

in hard water for cleaning of cloth.

[D].

as a foam depressant in distillation column.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of
[A].

nitric acid

[B].

sulphuric acid

[C].

ammonium sulphate

[D].

hydrochloric acid

Answer: Option B

Explanation:

No answer description available for this question.

Question: Coal tar is used as a
[A].

binding material for coal briquettes.

[B].

fuel in rotary kiln.

[C].

binder in making carbon electrodes.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: In an integrated steel plant, NH3 present in coke oven gas is normally recovered as
[A].

(NH4)2SO4

[B].

NH4Cl

[C].

(NH4)2 NO3

[D].

liquid NH3

Answer: Option A

Explanation:

No answer description available for this question.

Question: Naphthalene is removed from coke oven gas by
[A].

adsorbing on palladium.

[B].

absorbing in ethanolamine.

[C].

scrubbing with wash oil.

[D].

passing it through electrostatic precipitator.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Alum is commercially produced from
[A].

gypsum

[B].

feldspar

[C].

galena

[D].

bauxite

Answer: Option D

Explanation:

No answer description available for this question.