Chemistry · 2022
NEET 2022 · 4 September · Code W6 · Q54
Two half cell reactions are given below. Co^3++ e^- → Co^2+, E_Co^2+ / Co^3+^0=-1.81 V; 2 Al^3++6 e^- → 2 Al ( s ), E_Al / Al^3+^0=+1.66 V The…
Two half cell reactions are given below.
$$\begin{aligned}
& \mathrm{Co}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Co}^{2+}, \quad \mathrm{E}_{\mathrm{Co}^{2+} / \mathrm{Co}^{3+}}^0=-1.81 \mathrm{~V} \\
& 2 \mathrm{Al}^{3+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Al}(\mathrm{~s}), \quad \mathrm{E}_{\mathrm{Al} / \mathrm{Al}^{3+}}^0=+1.66 \mathrm{~V}
\end{aligned}
$$
The standard EMF of a cell with feasible redox reaction will be :
Official answer
(4)
+$\displaystyle 3.47$ V
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NEET (UG) 2022 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.