(D) When cinnabar $(HgS)$ is heated strongly in air,it undergoes roasting to form mercury metal and sulphur dioxide gas.The chemical reaction is: $HgS

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(D) When cinnabar $(HgS)$ is heated strongly in air,it undergoes roasting to form mercury metal and sulphur dioxide gas.The chemical reaction is: $HgS(s) + O_2(g) \xrightarrow{\Delta} Hg(l) + SO_2(g)$.Other metal sulphides like $Cu_2S$ or $Fe_2S_3$ typically form metal oxides upon roasting rather than the pure metal.