Q. No.
The cell potential for this reaction is 0.46V. Which of the following change will increase the potential the most ?
(1) concentration is doubled
(2) [Cu2+] concentration is halved
(3) Size of Cu(s) electrode is doubled
(4) size of Ag(s) electrode is decreased to half
Calculate ΔG° for the following redox reaction:
Cu²⁺ + Fe → Fe²⁺ + Cu
Given:
E°Cu²⁺/Cu = +0.34 V
E°Fe²⁺/Fe = −0.44 V
1. -65.62 KJ
2. -75.27 KJ
3. -150.54 KJ
4. +150.54 KJ
For the cell reaction
the change in free energy at a given temperature is a function of
(1) lnC1
(2) ln
(3) ln (C1 +C2)
(4) lnC2
Find the emf of the voltaic cell:
Ni | Ni²⁺(1 M) || Au³⁺(1 M) | Au
Given:
E°(Ni²⁺/Ni) = −0.25 V
E°(Au³⁺/Au) = +1.50 V
1. 1.25 V
2. -1.75 V
3. 1.75 V
4. 4.0 V
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
Pick out the incorrect statement
1. Equivalent conductance increases with dilution
2. Molar conductance increases with dilution
3. Specific conductance increases with dilution
4. Specific resistance increases with dilution
A device that converts energy of the combustion of fuels like hydrogen and methane, directly
into electrical energy is known as:
1. Fuel cell
2. Electrolytic cell
3. Dynamo
4. Ni-Cd cell
gas can’t be obtained by the electrolysis of any salt because-
1. Fluorine is the strongest reducing agent
2. Fluorine is the strongest oxidising agent.
3. Fluorine easily combine with atmospheric
4. All
If the E°cell for a given reaction has a negative value then which of the following gives the
correct relationships for the values of G° and Keq?
1. G° < 0;Keq > 1
2. G° < 0; Keq < 1
3. G°> 0; Keq < 1
4. G° > 0; Keq > 1
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