When cinnabar is heated in air, the gas evolved is:

C O_{2}

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S O_{2}

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S O_{3}

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C O

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Solution

The correct option is B $S O_{2}$
When cinnabar $(H_{2} S)$ , an ore of mercury is heated in air, it gets converted into mercuric oxide $(H g O)$ with evolution of sulphur dioxide gas $(S O_{2})$ .

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N H_{3}

C u O

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