Sonal has dropped her golden ring in $C u S O_{4}$ , solution. Does she need to worry? $E_{{A u}^{3 +} | A u}^{o} = 1.50 V, E_{{C u}^{2 +} | C u} V$

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Solution

$C u S O_{4} + A u$ is not favourable, energetically. At STP, there will be no reaction at all because Gold is much less reactive than copper so there will be negligible gold sulfate formed by substitution. Gold is the lowest metal in the electrochemical series, so it will not react chemically with salts of any other metal. So she does not need to worry

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Sonal has dropped her golden ring in CuSO4, solution. Does she need to worry?EoAu3+|Au=1.50V,ECu2+|CuV

Sonal has dropped her golden ring in $C u S O_{4}$ , solution. Does she need to worry? $E_{{A u}^{3 +} | A u}^{o} = 1.50 V, E_{{C u}^{2 +} | C u} V$