Electrolysis and Storage of Batteries

21. Chargmg of sulphated battery produces _________ heat.

1. no
2. very little
3. less
4. more

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22. Dry cell is modification of

1. Deniell cell
2. Leclanche cell
3. Lead-acid cell
4. Edison cell

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23. During charging the specific gravity of the electrolyte of a lead-acid battery

1. increases
2. decreases
3. remains the same
4. becomes zero

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24. During discharge, the active material of both the positive and negative plates is changed to

1. Pb
2. Pb02
3. PbO
4. PbS04

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25. During the charging of a lead-acid cell

1. its voltage increases
2. it gives out energy
3. its cathode becomes dark chocolate brown in colour
4. specific gravity of H2SO4 decreases

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26. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into

1. Pb02
2. PbSC-4
3. PbO
4. Pb

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27. Duringthe charging and discharging of a nickel-iron cell

1. corrosive fumes are produced
2. water is neither formed nor absorbed
3. nickel hydroxide remains unsplit
4. its e.m.f. remains constant

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28. Each cell has a vent cap

1. to allow gases out when the cell is on charge
2. to add water to the cell if needed
3. to check the level of electrolyte
4. to do all above functions

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29. Electrolyte used in a lead-acid cell is

1. NaOH
2. onlyH2S04
3. only water
4. dilute H2SO4

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30. Electrolyte used in an Edison cell is

1. NaOH
2. KOH
3. HC1
4. HN03

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