Cinnabar is heated in air which converts it into:

mercury sulphide

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mercury

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mercuric acid

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mercuric oxide

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Solution

The correct option is D mercuric oxide
Cinnabar $(H g S)$ is the ore of mercury. Cinnabar $(H g S)$ when heated in the air turns $H g S$ into $H g O$ (mercury oxide or mercuric oxide) accompanied by the liberation of sulphur dioxide.

$2 H g S + 3 O_{2} \to 2 H g O + 2 S O_{2}$

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(H g S)

Calcination is a process in which ore is heated in the absence of air. As a result of which the ___ ore is converted into its oxide.

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