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Chemistry · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 1 · Q3
Write the Nernst equation for the following cell reaction: Zn ( s )+ Cu^2+( aq ) → Zn^2+( aq )+ Cu ( s ) How will the E_cell be affected when…
Write the Nernst equation for the following cell reaction : \[\mathrm{Zn}(\mathrm{~s})+\mathrm{Cu}^{2+}(\mathrm{aq}) \rightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{~s}) \] How will the $\displaystyle \mathrm{E}_{\text {cell }}$ be affected when concentration of
(i)
$\displaystyle \mathrm{Cu}^{2+}$ ions is increased and
(ii)
$\displaystyle \mathrm{Zn}^{2+}$ ions is increased?
Marking-scheme solution
\(\displaystyle E_{\text {cell }}=E_{\text {cell }}^{\circ}-\frac{0.059}{2} \log \frac{\left[\mathrm{Zn}^{2+}\right]}{\left[\mathrm{Cu}^{2+}\right]}\) or any other correct mathematical expression of Nernst
equation
(i) \(\displaystyle E_{\text {cell }}\) will increase
\(\displaystyle (\) ii \(\displaystyle ) E_{\text {cell }}\) will decrease
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.