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21.

The most efficient agent for the absorption of SO3 is

A.	80% H2SO4	B.	98.5% H2SO4
C.	90% H2SO4	D.	20% oleum

22.

Which one of the following reactions is not an exothermic

A.	Absorption of sulphur troixide by 98.5% sulphuric acid	B.	Oxidation of sulphur trioxide
C.	Oxidation of sulphur to sulphur dioxide	D.	Thermal dissociation of iron pyrites

23.

Producer gas is obtained by

A.	thermal cracking of naphtha	B.	passing steam and air through red hot coke
C.	passing air through red hot coke	D.	passing steam through red hot coke

24.

The constituents of water gas are

A.	CO and H2O	B.	CO2 and N2
C.	CO and H2	D.	CO and N2

25.

Coke oven gas is composed of

A.	CH4 CO2 and H2O	B.	CO CH4 and N2
C.	CO2 CO AND H2	D.	H CO and CH2

26.

The producer gas is composed of

A.	CO and CO2	B.	CH4 and CO2
C.	CH4 and C2H4	D.	CO N2 and H2

27.

The producer gas is mainly used in

A.	petroleum refinery	B.	fertilizer industry
C.	steel industry	D.	pharmaceutical industry

28.

Which of the following reactions is an endothermic reaction?

A.	C(s) + O2(g) ?CO2(g)	B.	2C(s) + O2(g) ?2CO(g)
C.	C(s) + H2O(I) ?CO(g) + H2(g)	D.	CO(g) + 3H2(g) ?CH4(g) + H2O(g)

29.

Which of the following reactions is an exothermic reaction?

A.	CaO(s) + 3C(s) ?CaC2 + CO(g)	B.	CaCO3(s) ? CaO(s) + CO2(g)
C.	CaC2(s) + H2O(I) ? Ca(OH)2 + C2H2(g)	D.	C(s) + CO2(g) ?2CO(g)

30.

Acetylene is manufactured by

A.	reacting calcium carbide with liquid water	B.	Sachsse process
C.	Wulff process	D.	all of these ansers