The Calomel is

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${Hg}_{2} {Cl}_{2}$

${Hg}_{2} {({NO}_{3})}_{2}$

${HgSO}_{4}$

${HgCl}_{2}$

answer is B.

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Detailed Solution

The chemical compound with the formula ${Hg}_{2} {Cl}_{2}$ is mercury(I) chloride. The main example of a mercury(I) compound is dense white or yellowish-white, odorless solid, often known as calomel or mercurous chloride.
Calomel is therefore ${Hg}_{2} {Cl}_{2}$ .

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