The EMF of a Daniel cell at 298 K is E Zn|ZnSO4(0.01 M) || CuSO4(1.0 M)|Cu.
When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the EMF is changed to E2. The correct relationship between E1 and E2 is:

1. E1 > E2 2. E1 < E2
3. E1 = E2 4. E2 = 0 ≠ E1

Subtopic:  Electrode & Electrode Potential |
 79%
From NCERT
AIPMT - 2003
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The following metals should be arranged so that they push one another out of the salt solution in that order: 

Al, Cu, Fe, Mg, and Zn.
 

1. Cu <Fe<Zn< Al< Mg

2. Zn< Fe< Cu< Mg< Al

3. Mg<Cu <Zn <Fe< Al

4. Al<Zn<Fe< Cu< Mg

Subtopic:  Electrode & Electrode Potential |
 67%
From NCERT
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The correct increasing order of reducing power of the metals is:

K+/K = –2.93 V
Ag+/Ag = 0.80 V
Hg2+/Hg = 0.79 V
Mg2+/Mg = –2.37 V
Cr3+/Cr = – 0.74 V
 
1. Cr<Mg<K<Ag<Hg 2. Mg<K<Ag<Hg<Cr
3. K<Ag<Hg<Cr<Mg 4. Ag<Hg<Cr<Mg<K

Subtopic:  Electrode & Electrode Potential |
 85%
From NCERT
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The correct statement about the given galvanic cell equation is -

Zn(s) + 2Ag+­­­(aq) → Zn2+(aq) + 2Ag(s)

1. The current will flow from silver to zinc in the external circuit.
2. The current will flow from zinc to silver in the external circuit.
3. The current will flow from silver to zinc in the internal circuit.
4. The current will flow from zinc to silver in the internal circuit.

Subtopic:  Electrolytic & Electrochemical Cell |
 61%
From NCERT
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 2Cr(s) + 3Cd2+(aq)  2Cr3+(aq) + 3Cd

ECr3+/Cr= -0.74 VECd2+/Cd=-0.40 V

The value of Gro in the above reaction will be-

1. -196.83 kJ

2. 196.83 kJ

3. 186.83 kJ

4. -186.83 kJ

Subtopic:  Relation between Emf, G, Kc & pH |
 74%
From NCERT
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The incorrect statement(s) among the below is/are:

a. The unit of conductivity is S cm-2
b. Specific Conductivity of weak and strong electrolytes always decreases with a decrease in concentration.
c. The unit of molar conductivity is S cm2 mol-1
d. Molar conductivity increases with an increase in concentration.

1. a

2. a and d

3. b and d

4. a and c

Subtopic:  Conductance & Conductivity |
 57%
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The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S cm–1. The molar conductivity will be -

1. 124 S cm2 mol-1 2. 134 S cm2 mol-1
3. 128 S cm2 mol-1 4. 136 S cm2 mol-1
Subtopic:  Conductance & Conductivity |
 88%
From NCERT
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The electricity required in coulombs for the oxidation of 1 mole of FeO to Fe2Ois:

1. 964.87 C 2. 96487 C
3. 96.487 C 4. 9.6487 C
Subtopic:  Faraday’s Law of Electrolysis |
 86%
From NCERT
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The value of Ecell in the reaction below will be:

\(\small{Pt(s)|Br^{-}(0.010 \ M)|Br_{2}(l) \ ||H^{+}(0.030 \ M)|H_{2}(g)(1 \ bar)|Pt(s)}\)

\(E_{Br^{-}/Br_{2}}^{o} \ = \ -1.09 \ V\)

1. +1.298 V

2. -1.398 V

3. -1.298 V

4. -1.198 V

Subtopic:  Nernst Equation |
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The value of  ∆G°  in the reaction below would be:
\(\small{\mathrm{Zn}(\mathrm{s})+\mathrm{Ag}_2 \mathrm{O}(\mathrm{s})+\mathrm{H}_2 \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Zn}^{+2}(\mathrm{aq})+2 \mathrm{Ag}(\mathrm{s})+2 \mathrm{OH}^{-}(\mathrm{aq})}\)


Given: \(E_{cell}^{\circ} = 1.04V\)

1. 2.13 kJ

2. 21.3 kJ

3. 213.04 kJ

4. 31.12 kJ

Subtopic:  Relation between Emf, G, Kc & pH |
 75%
From NCERT
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