Chemical Engineering - Chemical Process

21. 

__________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant.

A. Pyrex
B. Soda lime
C. Lead
D. High silica

Answer: Option A

Explanation:

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22. 

The amount of benzene present in pure benzol is about __________ percent.

A. 30
B. 50
C. 70
D. 90

Answer: Option C

Explanation:

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23. 

Cumene (isopropyl benzene) is made by

A. oxidation of napthalene.
B. propylene alkylation of benzene.
C. polymerisation of a mixture of benzene & propylene.
D. none of these.

Answer: Option B

Explanation:

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24. 

Which of the following is not a pyrite ore?

A. Celestite
B. Galena
C. Gypsum
D. Siderite

Answer: Option D

Explanation:

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25. 

Mannheim furnace is used in the manufacture of

A. hydrochloric acid.
B. H2SO4 by Chamber process.
C. calcium carbide.
D. corundum.

Answer: Option A

Explanation:

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