Question

Write balanced chemical equations to explain what happens, when
(i) Mercuric oxide is heated.
(ii) Mixture of cuprous oxide and cuprous sulphide is heated.
(iii) Aluminium is reacted with manganese dioxide.
(iv) Ferric oxide is reduced with aluminium.
(v) Zinc carbonate undergoes calcination.​

Answer 1

i) 2HgO(s)→2Hg(l)+O2(g)

ii) 2Cu2O + Cu2S ⇨ 6Cu + SO2

iii) 3MnO2(s) + 4Al(s) → 3Mn(l) + 2Al2O3(s) + heat

iv) 2 Al(s) + Fe 2O 3(s) --> 2Fe (s) + Al 2O 3 (s)

v) ZnCO₃ → ZnO + CO₂