Chemistry · 2021
JEE Main · 31 August 2021, Shift 1 · Q55
Consider the following cell reaction Cd_( s ) + Hg_2 SO_4( s ) +9/5 H_2 O_(l) ⇌ CdSO_4 · 9/5 H_2 O_( s ) +2 Hg_(l). The value of E_cell^0 is 4.315 V…
Consider the following cell reaction
$$\mathrm{Cd}_{(\mathrm{s})}+\mathrm{Hg}_2 \mathrm{SO}_{4(\mathrm{~s})}+\frac{9}{5} \mathrm{H}_2 \mathrm{O}_{(l)} \rightleftharpoons \mathrm{CdSO}_4 \cdot \frac{9}{5} \mathrm{H}_2 \mathrm{O}_{(\mathrm{s})}+2 \mathrm{Hg}_{(l)} .
$$The value of $\displaystyle \mathrm{E}_{\text {cell }}^0$ is $\displaystyle 4.315$ V at $\displaystyle 25$°C. If $\displaystyle \Delta \mathrm{H}^{\circ}=-825.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$, the standard entropy change $\displaystyle \Delta \mathrm{S}^{\circ}$ in $\displaystyle \mathrm{J} \mathrm{K}^{-1}$ is \_\_\_\_. (Nearest integer)
[Given : Faraday constant $\displaystyle =96487 \mathrm{C} \mathrm{mol}^{-1}$ ]
Official answer
25
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JEE Main 2021 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.