Standard electrode potential of two metals A and B are 
and 
respectively. When half cells A 2+ /A and B 2+ /B are connected electrons flow from A to B but when A is connected with standard hydrogen electrode electrons flow from A to standard hydrogen electrode. If magnitude of 
and 
are 0.25 and 0.34 volt respectively the among the following the correct statement(s) is/are -
for A 2+ + 2e → A is –0.25 V
for B 2+ + 2e → B is –0.34 V
of the cell connecting these electrodes is 0.59 V
for B 2+ + 2e → B is 0.34 V
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(a, c, d)
The A is more oxidising than B and A is more oxidising than H 2
∴ A ⎯→ A 2+ + 2e 
= 0.25 V
A 2+ + 2e ⎯→ A 
= – 0.25 V
A ⎯→ A 2+ + 2e
B 2+ + 2e ⎯→ B
A + B 2+ ⎯→ A 2+ + B
= 0.34 + 0.25 = 0.59 V
= 
– 
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