Chemical Engineering - Chemical Process

46. 

Litharge is

A. lead oxide
B. zinc oxide
C. zinc sulphide
D. cellulosic photographic material

Answer: Option A

Explanation:

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47. 

Coagulant is used __________ filtration.

A. before
B. after
C. during
D. to avoid

Answer: Option A

Explanation:

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48. 

10% oleum comprises of 10% free

A. SO2
B. H2SO3
C. SO3
D. H2SO4

Answer: Option C

Explanation:

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49. 

Use of chlorine in the treatment of sewage

A. helps in grease separation.
B. increases the biological oxygen demand(BOD).
C. causes bulking of activated sludge.
D. aids in flocculation.

Answer: Option A

Explanation:

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50. 

Removal of dirt/soil by soaps or detergent does not involve the __________ of soil.

A. emulsification
B. dispersion
C. precipitation
D. wetting

Answer: Option C

Explanation:

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