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The standard reduction potentials at 25^...

The standard reduction potentials at `25^(@)C` for the following half reactions are given against each:
`Zn^(2+) (a.q) + 2e^(-) hArr Zn (s) : " " - 0.762`
`Cr^(3+) (a.q) 3e^(-) hArr Cr (s) , " " - 0.740`
`2H^(+) + 2e^(-) hArr H_(2) (g), " " 0.00`
`Fe^(3+) + e^(-) hArr Fe^(2+) , " " 0.77`
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
More negative is the reduction potential, higher will be the reducing property, i.e., the power to give up electrons.
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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 ?

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?

Knowledge Check

  • The standard reduction potentials at 298 K for the following half reactions are given against each Zn^(2+) (aq) + 2de hArr Zn(s) - 0.762 Cr^(3+)(aq) + 3e hArr Cr(s) - 0.74 2H^(+)(aq) + 2e hArr H_(2)(g) 0.00 Fe^(3+)(aq) + e hArr Fe^(2+)(aq) 0.77 Which is the stronger reducing agent ?

    A
    `Fe^(2+)(aq)`
    B
    `H_(2)(g)`
    C
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    D
    `Zn(s)`

  • The standard reduction potentials at 298 K for the following half reactions are given against eath Zn^(2+)(aq)+2e^(-) rarr Zn(s),-0.762 V Cr^(3+)(aq)+3e^(-)rarrCr(s),-0.740 v 2H^(+)(Aq)+2e^(-)rarrH_(2)(g),0.00V Fe^(3+)(aq)+e^(-)rarrFe^(2+)(aq),0.770 V Which is the strongest reducing agent

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    B
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    A
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    B
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    C
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    D
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