Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?

Mercury cells for caustic soda manufacture, compared to diaphragm cells

A

Require lower initial investment

B

Require more power

C

Produce lower concentration NaOH

D

None of these

In Kraft process of paper manufacture, white cooking liquor consists of caustic soda

A

Sodium sulphide & sodium carbonate

B

Sodium sulphite & sodium carbonate

C

Sodium sulphite & sodium sulphide

D

None of these

Wet chlorine gas produced during electrolysis of brine is dehydrated by

A

Spraying 66° Be H₂SO₄ counter current to the flow of the gas

B

Passing it through a bed of diatomaceous earth

C

Passing it through a bed of silica gel

D

None of these

Chlorine gas is produced by the electrolysis of brine (NaCl solution with solid NaCl make up) in mercury electrolytic cell. Which of the following is the anodic reaction?

A

Oxidation of Na⁺ ions

B

Oxidation of Cl^- ions

C

Reduction of Na⁺ ions

D

Reduction of Cl^- ions

What products do we get on electrolysis of saturated brine using steel cathode and graphite anode in an electrolytic cell?

A

Cl₂ & Na

B

Cl₂ & H₂

C

O₂ & H₂

D

Cl₂, H₂ & NaOH solution

Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?

A

High cost of mercury

B

High specific gravity of mercury

C

Non-availability of high purity mercury

D

Pollution of water stream by mercury

Exothermic neutralisation reaction between caustic soda and dodecylbenzene sulphonic acid produces sodium dodecylbenzene sulphate, which is a/an

A

Explosive

B

Soap

C

Detergent

D

Analgesic drug

Soap is prepared by boiling caustic soda with

A

Alcohol

B

Kerosene oil

C

Glycerine

D

Fats

Mercury electrolytic cells are preferred over diaphragm electrolytic cell (for production of caustic soda), as it

A

Has larger production capacity per unit cell

B

Consumes less power per ton of Cl₂ produced

C

Produces high purity (70%) caustic soda directly

D

All of the above

Caustic soda can be stored in __________ drums.

A

Steel

B

Cast iron

C

Brass

D

Gun metal

Which of the following is a co-product during the manufacture of caustic soda by electrolysis of brine?

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