Question:
$\mathrm{Cu}^{2+}$ salt reacts with potassium iodide to give
Correct Option: 1
Solution:
$2 \mathrm{Cu}^{+2}+4 \mathrm{I}^{-} \longrightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}(\mathrm{~s})+\mathrm{I}_{2}$
$2 \mathrm{Cu}^{+2}+3 \mathrm{I}^{-} \longrightarrow 2 \mathrm{CuI}+\mathrm{I}_{2}$