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Chemistry · 2025 · 1 mark
CBSE 2025 · Region 4 · Set 1 · Q1
In an electrochemical cell, the following reaction takes place: 2 Cu^+( aq )+ Zn ( s ) → 2 Cu ( s )+ Zn^2+( aq ); E_cell^°=1 · 28 V As the reaction…
In an electrochemical cell, the following reaction takes place : \[\begin{aligned} & 2 \mathrm{Cu}^{+}(\mathrm{aq})+\mathrm{Zn}(\mathrm{~s}) \rightarrow 2 \mathrm{Cu}(\mathrm{~s})+\mathrm{Zn}^{2+}(\mathrm{aq}) \\ & \mathrm{E}_{\text {cell }}^{\circ}=1 \cdot 28 \mathrm{~V} \end{aligned} \] As the reaction progresses, what will happen to the overall voltage of the cell ?
Official answer
(B)
It will decrease as $\displaystyle \left[\mathrm{Zn}^{2+}\right]$ increases.
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.