# The equation which is balanced and represents the correct product(s) is

1. A

${\mathrm{CuSO}}_{4}+4\mathrm{KCN}\to {\mathrm{K}}_{2}\left[\mathrm{Cu}\left(\mathrm{CN}{\right)}_{4}\right]+{\mathrm{K}}_{2}{\mathrm{SO}}_{4}$

2. B

${\mathrm{Li}}_{2}\mathrm{O}+2\mathrm{KCl}\to 2\mathrm{LiCl}+{\mathrm{K}}_{2}\mathrm{O}$

3. C

${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_{3}\right)}_{5}\right]}^{+}+5{\mathrm{H}}^{+}\to {\mathrm{Co}}^{2+}+5{\mathrm{NH}}_{4}^{+}+{\mathrm{Cl}}^{-}$

4. D

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### Solution:

Equation - 1 is not balanced with respect to charge.

Equation - 2 gives ${\mathrm{K}}_{3}\left[\mathrm{Cu}\left(\mathrm{CN}{\right)}_{4}\right]$ as product.

Equation - 3 reaction is unfavourable in the forward direction (${\mathrm{K}}_{2}\mathrm{O}$ is unstable, while ${\mathrm{LiO}}_{2}$ is stable).

Equation - 4 is correct and balanced.

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