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The standard reduction potential at 298 ...

The standard reduction potential at 298 K for the following half cell reactions are given below
`Zn^(2+)(aq)+2e^(-) to Zn(s) " " E^(@)=-0.762V`
`Cr^(3+)(aq)+3e^(-)toCr(s) " " E^(@)=-0.740V`
`2H^(+)(aq)+2e^(-) toH_(2)(g) " " E^(@)=0.0V`
`Fe^(3+)(aq)+e^(-) toFe^(2+)(aq) " " E^(@)=0.77V`.
Which is the strongest reducing agent ?

A

Zn (s)

B

Cr(s)

C

`H_(2)(g)`

D

`Fe^(2+)(aq)`.

Text Solution

Verified by Experts

The correct Answer is:
A
Zn has lowest reduction potential and it will be easily oxidised . Therefore , it acts as stron - gest reducing agent.
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