Question

$CuS{O}_4$ decolourises on addition of $KCN$, the product is

• A. $[Cu(CN{)}_4{]}^{2-}$
• B. $C{u}^{2+}$ get reduced to form $[Cu(CN{)}_4{]}^{3-}$
• C. $Cu(CN{)}_2$
• D. $CuCN$

Answer 1

Answer: (B)