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Given that, Ni^(2+)//Ni=0.25 V, Cu^(2+...

Given that,
`Ni^(2+)//Ni=0.25 V, Cu^(2+)//Cu=0.34 V`,
`Ag^(+)//Ag=0.80 V` and `Zn^(2+)//Zn=-0.76 V`
Which of the following reaction under standard condition will not take place in the specified direction ?

A

`Ni^(2+)(aq)+Cu(s)toNi(s)+Cu^(2+)(aq)`

B

`Cu(s)+2Ag^(+)(aq)toCu^(2+)(aq)+2Ag(s)`

C

`Cu(s)+2H^(+)(aq)toCu^(2+)(aq)+H_(2)(g)`

D

`Zn(s)+2H^(+)(aq)toZn^(2+)(aq)+H_(2)(g)`

Text Solution

Verified by Experts

The correct Answer is:
A, C
Cell reaction is spontaneous if its emf is +ve.
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