Easy
On heating a mixture of $Cu_2O$ and $Cu_2S$,the product obtained is:
- A$Cu + SO_2$
- B$Cu + SO_3$
- C$CuO + CuS$
- D$CuO$
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$4Au(s) + 8CN^-(aq) + 2H_2O(aq) + O_2(g) \to 4[Au(CN)_2]^-(aq) + 4OH^-(aq)$
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