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Class 12 Chemistry
Electrochemistry
Quiz 1
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If 96500 coulomb electricity is passed through CuSO solution, it will liberate
0%
63.5 gm of Cu
0%
31.76 gm of Cu
0%
96500 gm of Cu
0%
100 gm of Cu
Explanation
31.76 gm of Cu
Fused NaCl on electrolysis gives ………….. on cathode.
0%
Chlroine
0%
Sodium
0%
Sodium amalgam
0%
Hydrogen
Explanation
Sodium
The standard electrode potentials for the half cell reactions are:
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-0.35 V
0%
+0.35 V
0%
-1.17 V
0%
+1.17 V
Explanation
+0.35 V
Which of the following is a secondary cell?
0%
Leclanche cell
0%
Lead storage battery
0%
Concentration cell
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All of these
Explanation
Lead storage battery
For a certain redox reaction, E° is positive. This means that
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ΔG° is positive, K is greater than 1
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ΔG° is positive, K is less than 1
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ΔG° is negative, K is greater than 1
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ΔG° is negative, K is less than 1
Explanation
ΔG° is negative, K is greater than 1
Cell reaction is spontaneous, when
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E\(_{red}^{0}\) is negative
0%
ΔG° is negative
0%
E\(_{oxid}^{0}\) is Positive
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ΔG° is positive
Explanation
ΔG° is negative
Equilibrium constant K is related to E\(_{cell}^{0}\) and not E\(_{cell}\) because
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E\(_{cell}^{0}\) is easier to measure than E\(_{cell}\)
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E\(_{cell}\) becomes zero at equilibrium point but E\(_{cell}^{0}\) remains constant under all conditions
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at a given temperature, E\(_{cell}\) changes hence value of K can’t be measured
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any of the terms E\(_{cell}\) or E\(_{cell}^{0}\) can be used
Explanation
E\(_{cell}\) becomes zero at equilibrium point but E\(_{cell}^{0}\) remains constant under all conditions
Molar conductivity of 0.15 M solution of KCl at 298 K, if its conductivity of 0.0152 S cm
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124 Ω
0%
204 Ω
0%
101 Ω
0%
300 Ω
Explanation
101 Ω
Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. The electronic conductance depends on
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the nature and structure of the metal
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the number of valence electrons per atom
0%
change in temperature
0%
all of these
Explanation
all of these
The specific conductivity of N/10 KCl solution at 20°C is 0.0212 ohm
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3.324 cm
0%
1.166 cm
0%
2.372 cm
0%
3.682 cm
Explanation
1.166 cm
Faraday’s law of electrolysis is related to
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Atomic number of cation
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Speed of cation
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Speed of anion
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Equivalent weight of electrolyte
Explanation
Equivalent weight of electrolyte
The molar conductivity is maximum for the solution of concentration
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0.004 M
0%
0.002 M
0%
0.005 M
0%
0.001 M
Explanation
0.001 M
Units of the properties measured are given below. Which of the properties has been not matched correctly?
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Molar conductance = Sm mol
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Cell constant = m
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Specific conductance of = S m²
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Equivalence conductance = S m² (g eq)
Explanation
Specific conductance of = S m²
How long would it take to deposit 50 g of Al from an electrolytic cell containing Al
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1.54 h
0%
1.42 h
0%
1.32 h
0%
2.15 h
Explanation
1.42 h
The charge required for reducing 1 mole of MnO\(_{4}^{-}\) to Mn
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1.93 × 10
0%
2.895 × 10
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4.28 × 10
0%
4.825 × 10
Explanation
4.825 × 10
How much electricity in in terms of Faraday is required to produce 100 g of Ca from molten CaCl
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1F
0%
2F
0%
3F
0%
5F
Explanation
5F
If a current of 1.5 ampere flows through a metallic wire for 3 hours, then how many electrons would flow through the wire?
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2.25 × 10
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1.13 × 10
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1.01 × 10
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4.5 × 10
Explanation
1.01 × 10
How many coulombs of electricity is required to reduce 1 mole of Cr
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4 × 96500 C
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6 × 96500 C
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2 × 96500 C
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1 × 96500 C
Explanation
6 × 96500 C
A current of 1.40 ampere is passed through 500 mL of 0.180 M solution of zinc sulphate for 200 seconds. What will be the molarity of Zn
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0.154 M
0%
0.177 M
0%
2 M
0%
0.180 M
Explanation
0.177 M
How much time is required to deposit 1 × 10
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125 s
0%
115 s
0%
18.7 s
0%
27.25 s
Explanation
18.7 s
0 h : 0 m : 1 s
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