In which of the following isolations is no re | vedclass

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(C) In the isolation of mercury from cinnabar $(HgS)$,no external reducing agent is required. Mercury is obtained by the self-reduction method (auto-r

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Mercury from cinnabar

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(C) In the isolation of mercury from cinnabar $(HgS)$,no external reducing agent is required. Mercury is obtained by the self-reduction method (auto-reduction). First,cinnabar is roasted in air to form mercury$(II)$ oxide: $2HgS + 3O_2 \xrightarrow{\Delta} 2HgO + 2SO_2$ Then,the remaining $HgS$ reacts with $HgO$ to produce mercury metal: $2HgO + HgS \rightarrow 3Hg + SO_2$

In which of the following isolations is no reducing agent required?

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