Chemical Process - Chemical Engineering Questions and Answers

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Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

-83

-183

-196

-218

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Titanium dioxide is a/an __________ colour pigment.

white

black

yellow

blue

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Mercury cells for caustic soda manufacture, compared to diaphragm cells

require lower initial investment.

require more power.

produce lower concentration NaOH.

none of these.

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Cellulose percentage in bamboo fibre is about

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Essential oils are usually obtained using

steam distillation

extractive distillation

solvent extraction

leaching

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Impurities present in brine is normally removed by treatment with

NH₃ and CO₂.

lime and soda ash.

lime, ammonia and carbon.

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

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Hydrogenation of oil/fat does not

improve its resistance to rancid oxidation.

raise its melting point.

remove double bonds.

none of these.

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Solvay process as compared to dual process (i.e. modified Solvay process)

can use low grade brine.

has less corrosion problems.

involves higher investment in NH₃ recovery units than that for crystallisation units for NH₄Cl.

both (b) and (c).

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Builders are added in soap to act as

cleaning power booster

anti-redeposition agent

corrosion inhibitor

fabric brightener