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The standard reduction potential at 298 ...

The standard reduction potential at 298 K for the following half reactions are given below:
`Fe^(3+)(1M)+e^(-)rarrFe^(2+)(aq),E^(o)=0.770 V,`
`Zn^(2+)(1M)+2e^(-)rarrZn(s),E^(o)=-0.762 V`
`Cd^(2+)(1M)+2e^(-)rarrCd(s),E^(o)=-0.402 V,`
`2H^(+)(1M)+2e^(-)rarrH_(2)(g),E^(o) = 0.00 V.`
The strpongest reducing agent is:

A

Zn(s)

B

Cd(s)

C

`H_(2)(g)`

D

`Fe^(2+)(aq)`

Text Solution

Verified by Experts

The correct Answer is:
A
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The standard reduction potentials at 298K, for the following half cells are given: Zn^(2+)(aq)+2e^(-)hArrZn(s):E^(@)=-0.762V Cr^(3+)(aq)+3e^(-)hArrCr(s):E^(@)=-0.740V 2H^(+)(aq)+2e^(-)hArrH_(2)(g), E^(@)=0.000V Fe^(3+)(aq)+e^(-)hArrFe^(2+)(aq),E^(@)=0.770V Which is the stronget reducing agent?