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The standard reduction potentials at 298...

The standard reduction potentials at `298K` for the following half reactions are given against each

Which is the strongest reducing agent?
(a)`Zn(s)`
(b)`Cr(s)`
(c)`H_(2)(s)`
(d)`Fe^(2+)(aq)`

A

`Zn(s)`

B

`Cr(s)`

C

`H_(2)(s)`

D

`Fe^(2+)(aq)`

Text Solution

Verified by Experts

The correct Answer is:
a
`Zn` is the strongest reducing agent among the given options. The substance having smaller value of reduction potential are better reducing agents.
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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:

The standard reduction potentials at 298K for the following half cells are given : ZN^(2+)(aq)+ 2e^(-)Zn(s) , E^(@) = - 0.762V Cr^(3+)(aq)+ 3e^(-) Cr(s) , E^(@) = - 0.740V 2H^(+) (aq)+2e^(-) H_(2)(g) , E^(@)= 0.000V Fe^(3+)(aq)+ e^(-) Fe^(2+)(aq) , E^(@) = 0.770V which is the strongest reducing agent ?

Knowledge Check

  • Calculate the reduction potential for the following half cell reaction at 298 K. Ag^(+)(aq)+e^(-)toAg(s) "Given that" [Ag^(+)]=0.1 M and E^(@)=+0.80 V

    A
    0.741 V
    B
    0.80 V
    C
    `-0.80`V
    D
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  • Given below is a redox reaction. Which of the following types the reaction belongs to ? CuSO_(4(aq))+Zn_((s)) rarr Cu_((s))+ZnSO_(4(aq))

    A
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