問題一覧
1
Those galvenic cell which cannot be recharge again and again are known as
primary cell
2
Those galvanic cell which can be recharged again and again
secondary cell
3
Emf of dry cell
1.5V
4
Dry cell are also known as leclanche cell
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5
Which substance act as cathode in dry cell
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6
Which substance act as anode in dry cell
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7
Which substance act as electrolyte in dry cell
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8
Manganese gets reduced to form which compound in dry cell reaction
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9
Manganese gets reduced in dry cell reaction to
+4 to +3
10
Manganese gets reduced in dry cell reaction
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11
Net reaction of a dry cell is irreversible so it can be recharge
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12
Zinc gets oxidized in dry cell reaction
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13
Which complex is formed by Zn²+ with ammonia (NH3)
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14
Pb acts as cathode in lead storage battery
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15
Grid of lead packed with PbO2 act as cathode in lead storage battery
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16
Which substance act as electrolyte in lead storage battery
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17
In lead storage battery density of solution gets decreases during discharging
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18
In lead storage battery recharging is done by applying EMF in opposite direction to reverse the direction
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19
Those device which convert energy release during combustion of a substance into electrical energy are known as
fuel cell
20
Which fuel cell was used in Apollo space program
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21
Fuel cell can give constant emf because Qc can be kept constant by supplying gas at constant pressure
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22
During discharging reaction of lead storage battery lead sulphate (PbSO4) gets dissociated
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23
During discharging reaction of lead storage battery PbO2 converts to Pb²+
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24
During discharging reaction of lead storage battery Pb converts to Pb²+
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25
Dry cell is commonly used in our transistor and clocks
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26
Mercury cells suitable for low current devices like hearing AIDS watches etc
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27
Which substance act as anode in Mercury cell
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28
Which substance act as cathode in Mercury cell
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29
Which substance act as electrolyte in Mercury cell
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30
EMI produced by Mercury cell
1.35V
31
A: cell potential of Mercury cell remains constant during its life R: overall cell reaction does not involve any ion
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32
Spongy lead acts as anode in lead storage battery
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33
When the lead storage cell discharges it act as voltaic cell
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34
Nickel cadmium cell is expensive than lead storage battery
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35
Anode in nickel cadmium cell
cadmium
36
Nickel cadmium cell has more life than lead storage battery
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37
Cathode in nickel cadmium cell
metal grid containing NiO2
38
Electrolyte in nickel cadmium cell
KOH solution
39
Fuel cells are pollution free and have high efficiency
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40
Efficiency of fuel cell
70%
41
Efficiency of thermal power plant
40%
42
Electrolyte used in hydrogen oxygen fuel cell
NaOH
43
Catalysts like finely divided platinum or palladium metal are incorporated into the electrodes for increasing the rate of electrode reactions
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44
The water vapours produced during the reaction were condensed and added to the drinking water supply for the astronauts.
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45
Incorrect statement about dry cell is
Zn container act as cathode
46
Incorrect statement about Mercury cell
paste of KOH and ZnO act as anode
47
A: energy conversion from chemical energy to electrical energy is more efficient by galvanic cell in compared to thermal power plants R: galvanic cell directly convert chemical energy into electrical energy
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48
It is now possible to make such cell in which reactants are fed continuously to the electrodes and products are removed continuously
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