Chemical Engineering - Chemical Process

16. 

Rotary kiln is not involved in the production of

A. cement
B. lime from limestone
C. slaked lime from quick lime
D. none of these

Answer: Option C

Explanation:

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17. 

Mercury electrolytic cell produces 50-70% NaOH solution. Its operating temperature is __________ °C.

A. 25
B. 60-70
C. 150-200
D. 250-300

Answer: Option B

Explanation:

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18. 

Vanillin is a type of

A. anti-pyretic drug
B. food preservative
C. flavour
D. dye

Answer: Option C

Explanation:

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19. 

Temporary hardness of water can be removed by

A. addition of alum (a coagulant).
B. boiling.
C. filtration (through gravity sand filter).
D. addition of lime.

Answer: Option B

Explanation:

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20. 

More than 100 percent of __________ is present in oleum.

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

Answer: Option B

Explanation:

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