Chemical Engineering - Chemical Process

31. 

Vulcanisation of rubber

A. decreases its tensile strength.
B. increases its ozone & oxygen reactivity.
C. increases its oil & solvent resistance.
D. converts its plasticity into elasticity.

Answer: Option D

Explanation:

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32. 

Raw materials for 'Solvay Process' for manufacture of the soda ash are

A. salt, limestone and coke or gas.
B. ammonia, salt and limestone.
C. ammonia limestone and coke.
D. none of these.

Answer: Option A

Explanation:

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33. 

Chloral is used in the manufacture of

A. DDT
B. BHC
C. parathion
D. none of these

Answer: Option A

Explanation:

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34. 

Bromine is used in the preparation of

A. fire extinguishing compounds.
B. fire proofing agents.
C. dyes and antiknock compounds.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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35. 

Sudden temperature fluctuation does not affect pyrex glass, because of its

A. low co-efficient of expansion.
B. high co-efficient of expansion.
C. high melting point.
D. both (b) and (c).

Answer: Option A

Explanation:

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