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31.

The raw materials for the manufacature of calcium carbide are

A.	limestone and coke	B.	limestone and slaked lime
C.	limestone and sand	D.	limestone and caustic soda

32.

The liquefaction of gases in general is favoured at

A.	low temperature and low pressure	B.	low temperature and high pressure
C.	high temperature and high pressure	D.	high temperature and low pressure

33.

High purity oxygen is used for

A.	welding	B.	cutting of metals
C.	medicinal purposes	D.	all of the above

34.

Nitrogen gas is used

A.	as protective atmosphere to prevent oxidation in metal working and food preservation	B.	for welding
C.	for cutting of metals	D.	as refrigerant

35.

The percentage by volume of argon in the air is about

A.	2.97%	B.	0.94%
C.	0.01%	D.	0.00%

36.

The quantity of electricity required to deposit one gram equivalent of any substance is

A.	one coulomb	B.	one faraday
C.	one ampere	D.	one microfaraday

37.

When the same quantity of electricity is passed through different solutions the amounts of different substances produced are proportional to

A.	their atomic weight	B.	their molecular weight
C.	their equivalent weight	D.	the square of their equivalent weight

38.

The degree of ionisation does not depend upon

A.	nature of solvent	B.	nature of solute
C.	temperature	D.	current strength

39.

The flow of current is actually flow of

A.	?-particles	B.	?-particles
C.	? -praticles	D.	mesons

40.

Select the correct statement

A.	Electrolysis cell uses exothermic reactions to produce electrical energy	B.	In the electrolysis cell the positive current flows from the positive electrode to the negative electrode outside the cell
C.	Electrolysis cell uses electrical energy to produce endothermic chemical changes	D.	In the electrolysis cell the positive current flows from the negative electrode to the positive electrode inside the cell