Chemical Engineering - Chemical Process

21. 

The most widely used coagulant for removing suspended impurities from water is

A. bleaching powder
B. chlorine
C. calcium sulphate
D. alum

Answer: Option D

Explanation:

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22. 

Main constituent of limestone is

A. CaCO3
B. MgCO3
C. Na2CO3
D. CaSO4

Answer: Option A

Explanation:

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23. 

__________ is obtained as a by-product in the manufacture of sodium hydroxide using brine.

A. Chlorine
B. Ammonium chloride
C. Sodium carbonate
D. Sodium bi-carbonate

Answer: Option A

Explanation:

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24. 

Fat splitting catalyst is

A. CaCO3
B. ZnO
C. Al2O3
D. Fe

Answer: Option B

Explanation:

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25. 

Phthalic anhydride is used

A. in making PVC
B. as plasticisers
C. in insecticides manufacture
D. for making nylon-6

Answer: Option B

Explanation:

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