The same amount of electric current is apassed through aqueous solution of MgSO4 and AlCl3. If 2.8 g Mg metal is deposited at amount of Al metal deposited in second cell will be

1. 2.1 g

2. 2.49 g

3. 3.15 g

4. 3.73g

Subtopic:  Faraday’s Law of Electrolysis |
 77%
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The potential of the following concentration cell at room temperature is-

Pt, H2(g) |H(10-6M)||H(10-4 M) | H2(g), Pt

(1) -0.118V

(2) -0.0591V

(3) 0.118V

(4) 0.0591V

Subtopic:  Nernst Equation |
 58%
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Select the incorrect statement for dry cell

(1) Mn is reduced from Mn+4 to Mn+3

(2) NH3 gas libreted out

(3) Zn is used as anode

(4) Paste of NH4Cl and ZnCl2 is used

Subtopic:  Electrochemical Series |
 54%
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What is the current efficiency of an electrode deposition of Cu metal from CuSO4 solution in which 9.8 gm copper is deposited by the passage of 5 amperes current for 2 hours?

1. 41.4 %

2. 50%

3. 75%

4. 82.8 %

Subtopic:  Faraday’s Law of Electrolysis |
 58%
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During electrolysis, 2A current is passed through an electrolytic solution for 965 s. The number of moles of electrons passed will be

1. 0.02

2. 0.01

3. 200

4. 0.037

Subtopic:  Faraday’s Law of Electrolysis |
 81%
From NCERT
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ENi+2Ni0 = -0.25 V, EAu+3Au0 = 1.50 V

the emf of Voltaic cell

Ni | Ni+2(1M) || Au+3(1M) Au is:-

(1) 1.25 V

(2) -1.75 V

(3) 1.75 V

(4) 4 V

Subtopic:  Nernst Equation |
 82%
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EMF of the following cell will be zero if

Pt(H2)|H+||H+|(H2)Pt

    P1   C1  C2    P2

(1) C1P1 = C2P2

(2) C1P2 = P2C1

(3) C12P2 = C22P1

(4) None of these

Subtopic:  Nernst Equation |
 50%
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For the cell reaction

Cuc1+2 (aq) +Zn(s)            ZnC2+2 (aq) + Cu(s)

the change in free energy at a given temperature is a function of 

(1) lnC1

(2) lnC2C1 

(3) ln (C1 +C2)

(4) lnC2

Subtopic:  Electrode & Electrode Potential |
 92%
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Which of the following is an incorrect statement :- 

1. Mercury cell is a primary cell providing a constant potential

2. During recharging lead storage cell works as electrolytic cell

3. Galvanised iron does not rust

4. In electrolytic cell reduction occurs at anode and in galvanic cell oxidation takes place at anode

Subtopic:  Electrochemical Series |
 72%
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The cell reaction of micro electrochemical cell formed during rusting of iron is:-

1.  O2(g) + 4H(aq)  + 4e-  2H2O (l)

2. 4Fe+2(aq)  + O2(g) + 2H2O(l)  4FeO + 4H(aq)

3. 2Fe(s) + O2(g) + 4H°(aq) 2Fe+2(aq)  + 2H2O(aq)

4.  Fe(s) Fe+2(aq) + 2e-

Subtopic:  Corrosion |
 65%
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