Electrolysis and storage of batteries Archives

11. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

compactness

lower e.m.f.

small quantity of electrolyte used

higher internal resistance

Detailed SolutionAs compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

12. During the charging of a lead-acid cell

Its voltage increases

It gives out energy

Its cathode becomes dark chocolate brown in colour

Specific gravity of H2SO4 decreases

Detailed SolutionDuring the charging of a lead-acid cell

13. Chargmg of sulphated battery produces ____ heat.

very little

less

Detailed SolutionChargmg of sulphated battery produces ____ heat.

14. The active materials of a nickel-iron battery are

nickel hydroxide

powdered iron and its oxide

21% solution of kOH

all of the above

Detailed SolutionThe active materials of a nickel-iron battery are

15. Internal resistance of a cell is due to

resistance of electrolyte

electrode resistance

surface contact resistance between electrode and electrolyte

all above

Detailed SolutionInternal resistance of a cell is due to

16. Which of the following primary cells has the highest voltage ?

Manganese-alkaline

Carbon-zinc

Lithium

Mercury

Detailed SolutionWhich of the following primary cells has the highest voltage ?

17. Electrolyte used in an Edison cell is

NaOH

KOH

HCl

HNO3

Detailed SolutionElectrolyte used in an Edison cell is

18. Short circuiting of a cell may be caused

buckling of plates

faulty separators

lead particles forming circuit between positive and negative plates

excessive accumulation of sediment E. any one of above

Detailed SolutionShort circuiting of a cell may be caused

19. During the charging and discharging of a nickel-iron cell

corrosive fumes are produced

water is neither formed nor absorbed

nickel hydroxide remains unsplit

its e.m.f. remains constant

Detailed SolutionDuring the charging and discharging of a nickel-iron cell

20. The open circuit voltage of any storage cell depends wholly upon

its chemical constituents

on the strength of its electrolyte

its temperature

all above

Detailed SolutionThe open circuit voltage of any storage cell depends wholly upon

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