JEE CHEMISTRY MCQ: ELECTRO CHEMISTRY

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Analyzing +4 | -1

298 \mathrm{~K}

, the standard oxidation potential of

\mathrm{A}\left|\mathrm{A}^{+2}, \mathrm{~B}\right| \mathrm{B}^{+2}, \mathrm{C}\left|\mathrm{C}^{+1} , \mathrm{D}\right| \mathrm{D}^{+3}

are

0.28 \mathrm{~V},-0.56 \mathrm{~V}

0.15 \mathrm{~V},-2.0 \mathrm{~V}

respectively.

On the basis of standard oxidation potential, predict which of the following reaction can not occur:

View answer and explanation

Correct option: C

\mathrm{A}^{+2}

will be reduced by

\mathrm{D}

The correct answer is that A+2 will be reduced by D because the cell potential for the reaction is negative, indicating a non-spontaneous reaction.

More Questions from ELECTRO CHEMISTRY

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25^{\circ} \mathrm{C}

0.295 \mathrm{~V}

{p_1}{\kern 1pt} {\kern 1pt} \mathrm{and}{\kern 1pt} {\kern 1pt} {p_2}

\mathop {\mathrm{Pt}\left( {{\mathrm{H}_2}} \right)}\limits_{{p_1}} \left| {\mathop {{\mathrm{H}^ + }\left( {aq} \right)}\limits_{1\mathrm{ }M} } \right|\mathop {Pt\left( {{\mathrm{H}_2}} \right)}\limits_{{p_2}}

\mathrm{CuS}{\mathrm{O}_4}

{AlCl}_3

STP

({F}=96500 {C})

2 \mathrm{Ag}(\mathrm{s})+\mathrm{S}^{2-}(\mathrm{aq}) \rightarrow \mathrm{Ag}_2 \mathrm{S}(\mathrm{s})+2 \mathrm{e}^{-}

\mathrm{pH}=3

0.1 \mathrm{~M}-\mathrm{H}_2 \mathrm{S},

\mathrm{H}_2 \mathrm{S}, K_{\mathrm{a}_1}=10^{-8} ; K_{\mathrm{a}_2}=10^{-13}, K_{\mathrm{sp}}

\mathrm{Ag}_2 \mathrm{S}=4 \times 10^{-48},

E^{\circ}_{{\mathrm{Ag} | \mathrm{Ag}}^{+}}=0.80 \mathrm{~V},

\log 2=0.3,

2.303 R T / F=0.06