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