Chemistry · 2021
JEE Main · 3 August 2021, Shift 1 · Q56
The logarithm of equilibrium constant ( log_10 K ) for the reaction Pd^2+_( aq ) +4 Cl^-_( aq ) ⇌ PdCl_4^2-_( aq ) is x × 10^-1. The value of x is \…
The logarithm of equilibrium constant $\displaystyle \left(\log _{10} \mathrm{~K}\right)$ for the reaction
$$\mathrm{Pd}^{2+}{ }_{(\mathrm{aq})}+4 \mathrm{Cl}^{-}{ }_{(\mathrm{aq})} \rightleftharpoons \mathrm{PdCl}_4^{2-}{ }_{(\mathrm{aq})}
$$
is $\displaystyle x \times 10^{-1}$. The value of $\displaystyle x$ is \_\_\_\_. (Nearest integer)
[Given emf for the half-cell at $\displaystyle 25$°C
$$\begin{aligned}
& \mathrm{Pd}^{2+}{ }_{(\mathrm{aq})}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Pd}_{(\mathrm{s})} \quad \mathrm{E}^{\circ}=0.83 \mathrm{~V} \\
& \left.\mathrm{PdCl}_4{ }^{2-}{ }_{(\mathrm{aq})}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Pd}(\mathrm{~s})+4 \mathrm{Cl}^{-} \quad \mathrm{E}^{\circ}=0.64 \mathrm{~V}\right]
\end{aligned}
$$
Official answer
64
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JEE Main 2021 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.