The cell reaction of micro electrochemical cell fromed during rusting of iron is:-

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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 electric cell reduction occurs at anode and in galvanic cell oxidation takes place at anode

Concept Questions :-

Electrochemical series
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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

Concept Questions :-

Electrode Potential / Introduction
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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

Concept Questions :-

Nernst Equation
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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

Concept Questions :-

Nernst Equation
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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

Concept Questions :-

Faraday’s Law of Electrolysis
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The potential of following cell at K 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

Concept Questions :-

Nernst Equation
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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

Concept Questions :-

Electrochemical series
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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 %

Concept Questions :-

Faraday’s Law of Electrolysis
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Electrolysis of hot aqueous solution of NaCl gives NaClO4 as-

NaCl +4H2O           NaClO4 + 4H2

How many faraday are required to obtain 1000 g of sodium perchlorate ?

(1) 66 F

(2) 122.5 F

(3) 15.13 F

(4) 1.86 F

Concept Questions :-

Faraday’s Law of Electrolysis
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