Assertion : Zinc displaces copper from copper sulphate solution. Reason : The $E^{\circ}$ of zinc is $-0.76…
Assertion : Zinc displaces copper from copper sulphate solution.
Reason : The $E^{\circ}$ of zinc is $-0.76 \mathrm{~V}$ and that of copper is $+0.34 \mathrm{~V}$.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Solution
\(\begin{aligned}
& Z n(s)+C u^2+_{(a q)} \rightarrow Z n^2+{ }_{(a q)}+C u_{(s)} \\
& E_{C u^{2+} / C u}^{\circ}=0.34 V, E_{Z n / Z n}^{\circ}=-0.76 V
\end{aligned}\)
Higher reduction potential of \(\mathrm{Cu}^{2+}\) ion than \(\mathrm{Zn}^{2+}\) ion shows that \(\mathrm{Cu}^{2+}\) ion has more tendency to undergo reduction.