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

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answer is A.

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Detailed Solution

Concept: By just going through the heating process, the less reactive metal ores can produce the corresponding metals in pure form. Mercury sulphide is heated in the presence of air to produce the mercuric oxide, which can then be heated further to produce mercury metal.
Iodine, bromine, and chlorine are non-metals; in reality, they are halogens, if we take into account the possibilities provided in the question. It was made explicit in the question that it had to be a metal that is liquid at normal temperature. Since none of these meets this requirement, we will only be concentrating on mercury as the final alternative.
Mercury is the only metal that can be found in a liquid condition at room temperature. The main ore of mercury is cinnabar, having a formula

H g S

. The extraction of mercury involves mainly two steps.
Concentration- removal of dirt from ore
Ore is heated during roasting while being exposed to oxygen. Metal oxide and sulfur oxide are formed.

By further heating, Hg has separated as-

Hence, the correct answer is option 1.

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