Chemical Engineering - Chemical Process

21. 

Heating of __________ to 120°C, produces plaster of paris.

A. blue vitriol
B. gypsum
C. calcium silicate
D. calcium sulphate

Answer: Option B

Explanation:

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22. 

Pick out the wrong statement.

A. Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98%.
B. The chemical formula of oleum is H2S2O7, which is formed by saturating sulphuric acid with sulphur trioxide.
C. Vitriol oil is nothing but technical sulphuric acid.
D. Decomposition of sulphuric acid on heating does not start before its boiling.

Answer: Option D

Explanation:

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23. 

Which of the following has sodium bicarbonate as its main constituent ?

A. Baking soda
B. Baking powder
C. Washing soda
D. none of these

Answer: Option B

Explanation:

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24. 

Ordinary glass is not a/an

A. amorphous isotropic material.
B. supercooled liquid.
C. material with sharp definite melting point.
D. electrical insulator.

Answer: Option C

Explanation:

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25. 

In premitive days, __________ was being manufactured by Leblanc Process.

A. alum
B. washing soda
C. soda ash
D. calcium carbide

Answer: Option C

Explanation:

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