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The standard potentials at 298 K for the...

The standard potentials at `298 K` for the following halfreactions are as given
` Zn^(2+) + 2e underset(larr)(rarr) Zn E^o =- 0/ 762 V`.
`2 H^+ + 2 Erarr H_2 (g) E^o = 0.000 V`
`Cr^(3+) + 3e underset(larr)(rarr) Cr E^o =- 0.740 V`
`Fe^(3+) 2e rarr Fe^(2+) E^o =0.772 V`
Which of the following is the strongest reducing agent ?

A

Zn (s)

B

Cr

C

`H_(2) (g)`

D

`Fe^(2+) (aq)`

Text Solution

Verified by Experts

The correct Answer is:
A
More negative the standard potential least the reducion tendcy of the ion. The corresponding atom has largest oxidation tendency and thus is a sterong reducing agent. `Zn` is the strongest reucing afent.
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The standard potentials at 25^@C for the following half reactions are given against them Zn^(2+) +2e^(-) rarr Zn, E^0 =-0 . 762 V Mg^(2+) +2e^(-) rarr Mg, =- 2.37 V . When zinc dust is added to a solution of magnesium chloride .

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 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?

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:

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