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  • A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

A metal that exists as a liquid at room temperature is obtained by heating its sulphide in the presence of air. Identify the metal and its ore and give the reaction involved.

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Ans.
The only metal that exists as a liquid at room temperature is mercury (Hg).
Mercury is obtained from the sulphide ore called cinnabar (HgS).
Cinnabar (HgS) is first heated in air. This turns HgS [mercury sulphide or cinnabar] into HgO (mercury oxide); by liberation of sulphur dioxide.
The reactions involved are:
Roasting
2HgS + 3O_{2} \rightarrow 2HgO + 2SO_{2}
Heating
2HgO \rightarrow 2Hg + O_{2}

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