JEE MAIN - Chemistry (2005 - No. 30)
On heating mixture of $$C{u_2}O$$ and $$C{u_2}S$$ will give :
$$C{u_2}S{O_3}$$
$$CuO + CuS$$
$$Cu + S{O_3}$$
$$Cu + S{O_2}$$
Explication
$$2C{u_2}O + C{u_2}S\buildrel \, \over
\longrightarrow 6Cu + S{O_2}$$ self reduction