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Important questions on Fuel Cells

The secondary battery is such a battery:

A
which cannot be recharged
B
which can be recharged
C
which can be reused after replacing its chemical
D
which is charged by primary cells
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Primary battery is a battery:

A
which can be recharged.
B
which cannot be reconditioned by replacing chemical.
C
which cannot be reused.
D
which cannot be recharged.
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In which cell the free energy of a chemical reaction is directly converted into electricity 

A
Lenclanche cell
B
Concentration cell
C
Fuel cell
D
Lead storage battery
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The overall reaction of a hydrogen-oxygen fuel cell is:

A
B
C
D
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A secondary cell is one that :

A
can be recharged
B
can be recharged by passing current through it in the same direction
C
can be recharged by passing current through it in the opposite direction
D
can not be recharged
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