JEE CHEMISTRY MCQ: ELECTRO CHEMISTRY

1 Medium

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Application +4 | -1

A solution is 1 molar in each of

{NaCl}, {CdCl}_2,{ZnCl}_2

and

{PbCl}_2

. To this

{Sn}

metal is added, which of the following is true?

\left[\begin{array}{l} \text { Given } \quad {E}^{\circ}\left({Pb}^{2+} /{Pb}=-0.126 \mathrm{~V}\right) \\ {E}_{{Sn}^2 /{Sn}}^{\circ}=-0.136 \mathrm{~V},{E}_{{Cd}^{2+} / {Cd}}^{\circ}=-0.40 \mathrm{~V} \\ {E}_{{Zn}^{2+} / {Zn}}^{\circ}=-0.763 \mathrm{~V}, {E}_{{Na}^{+} /{Na}}^{\circ}=-2.71 \mathrm{~V} \end{array}\right]

View answer and explanation

Correct option: D

{Sn}

can reduce

{Pb}^{2+}

{Pb}

Option D (

{Sn}

can reduce

{Pb}^{2+}

{Pb}

) is correct because the standard reduction potential of Sn is lower than that of Pb, making Sn 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