JEE CHEMISTRY MCQ: ELECTRO CHEMISTRY

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Analyzing +4 | -1

Standard potentials

\left(E^{\circ}\right)

for some half-reactions are given below:

(i)

{Sn}^{4+}+2 {e}^{-} \rightarrow {Sn}^{2+} ; E^{\circ}=+0.15 {~V}

(ii)

2 {Hg}^{2+}+2 {e}^{-} \rightarrow {Hg}_2{ }^{2+} ; E^{\circ}=+0.92 {~V}

(iii)

{PbO}_2+4 {H}^{+}+2 {e}^{-} \rightarrow {Pb}^{2+}+2 {H}_2 {O} ; E^{\circ}=+1.45 {~V}

Based on the above, which one of the following statements is correct?

View answer and explanation

Correct option: B

{Sn}^{2+}

is a stronger reducing agent than

{Hg}_2{ }^{2+}

Option B (

{Sn}^{2+}

is a stronger reducing agent than

{Hg}_2{ }^{2+}

) is correct because a more negative standard reduction potential indicates a stronger reducing agent.

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