Chemical Engineering - Chemical Process

31. 

__________ is used as a flux in the smelting of copper ore like chalcopyrite.

A. Coke breeze
B. Lime powder
C. Silica/quartz
D. Dolomite

Answer: Option C

Explanation:

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32. 

Phenol formaldehyde is produced by condensation polymerisation. It is also known as

A. teflon
B. bakelite
C. polyester
D. nylon-66

Answer: Option B

Explanation:

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33. 

Hydrogenation of oil does not

A. remove double bonds.
B. raise its melting point.
C. improve its resistance to oxidation.
D. none of these.

Answer: Option D

Explanation:

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34. 

Main constituents of cotton fiber is

A. lignin
B. cellulose
C. starch
D. gelatine

Answer: Option B

Explanation:

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35. 

CaCl(OCl) is the chemical formula of

A. hypo
B. bleaching powder
C. plaster of paris
D. aqua regia

Answer: Option B

Explanation:

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