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Class 12
CHEMISTRY
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 reducting agent?

A

`Zn(s)`

B

`Cr(s)`

C

`H_(2)(s)`

D

`Fe^(2+)(aq)`

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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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Define standard reduction potential.

The standard reduction potential at 298 K for single electrodes are given below.l From this we can tell that

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
    `Cr(s)`
    D
    `Zn(s)`

  • The reduction potential of NCE at 298 K is

    A
    0.3338 V
    B
    0.2415 V
    C
    0.28 V
    D
    0.76 V

  • 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`
    B
    `Cr`
    C
    `H_(2)(g)`
    D
    `Fe^(2+) (aq)`

    • Similar Questions

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    The standard reduction potential at 298K for the following half reaction are given against each Zn^(2+)(aq)+2e^(-)hArrZn(s)" "-0.762 Cr^(3+)(aq)+2e^(-)hArrCr(s)" "-0.740 2H^(+)(aq)+2e^(-)hArrH_(2)(g)" "0.000 Fe^(3+)(aq)+2e^(-)hArrFe^(2+)(aq)" "0.770 which is the strongest reducing agent

    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

    Standard reduction potential is calculated at

    Standard reduction potential of an element equal to

    The standard reduction potential at 298 K for the following half cell reactions are given below: Zn_((aq))^(2+)+2e^(-)to Zn_((s)),E^@=-0.762 V Cr_((aq))^(3+)+3e^(-)to Cr_((s)),E^@=-0.740 V 2H_((aq))^++2e^(-)to H_(2(g)),E^@=0.0 V Fe_((aq))^(3+)+e^(-)toFe_((aq))^(2+),E^@=0.77 V Which is the strongest reducing agent?

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