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41.

Select the wrong statement

A.	Voltaic cell uses exothermic chemical reactions to produce electrical energy	B.	In the voltaic cell the positive current flows from the positive electrode to the negative electrode outside the cell
C.	A voltaic cell can become an electrolysis cell by use of an external voltage greater than the voltaic cell voltage and imposed in the opposite directions	D.	Voltaic cell uses electrical energy to produce endothermic chemical changes

42.

Electrolytes when dissolved in water dissociate into their constituentions. The degree of dissociation of an electrolyte increases with

A.	increasing concentration of the electrolyte	B.	decreasing concentration of the electrolyte
C.	decreasing temperature	D.	none of the above

43.

The quantity of an ion discharged druing electrolysis is not directly proportional to

A.	time	B.	current
C.	resistance	D.	chemical equivalent of the ion

44.

A redox reaction is

A.	proton transfer reaction	B.	a reaction in gas phase
C.	electron transfer reaction	D.	ion combination reaction

45.

In electrolysis oxidation takes place at

A.	abnode	B.	cathode
C.	both the electrodes	D.	none of the electrodes

46.

In a fuel cell

A.	electrical energy is converted into chemical energy	B.	chemical energy is converted into electrical energy
C.	electrical energy is converted into mechanical energy	D.	mechanical energy is converted into electrical energy

47.

Diaphragm electrolytie cell produces

A.	70% NaOH solution	B.	60% NaOH solution
C.	98.5% NaOH solution	D.	10-12% NaOH solution

48.

Mercury electrolytic cell produces

A.	10-12% NaOH solution	B.	50-70% NaOH solution
C.	97-98.5% NaOH solution	D.	20-25% NaOH solution

49.

When a saturated sodium chloride solution is electrolysed using graphic anode and steel cathode the products are

A.	sodium metal and chlorine	B.	hydrogen and oxygen
C.	hydrogen chlorine and sodium hydroxide solution	D.	hydrogen chlogrine and soda ash

50.

Mercury electrolytic cells are operated at a temperature of

A.	60 - 70 ?C	B.	130 - 140 ?C
C.	200 - 215 ?C	D.	100 - 110 ?C