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Question
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.
Solution
Mercury is the metal which is liquid at room temperature. Ore of Mercury is Cinnabar. When we heat cinnabar in
atmospheric oxygen following reaction takes place.
`2"HgS"("s") + 3"O"_2("g") overset("Heat")(->) 2"HgO"("s") + 2"SO"_2("g")`
`2"HgO"("s") overset("Heat")(->) 2"Hg"("l") + "O"("g")`
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