Copper II Oxide

Q. What compound is formed when copper sulphate solution reacts with an excess of $KCN$?

1. $K_2\left[Cu\right(CN{)}_4]$
2. $Cu(CN{)}_2$
3. $K_3\left[Cu\right(CN{)}_4]$
4. $CuCN$

Q. Cupric oxide when heated to 1100-1200 degree Celsius gives $CuO\to A+O_2$

1. $C{u}_{2}O$
2. No Reaction possible
3. $Cu$
4. $C{u}_2{O}_3$