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GK QUESTION#3376

Mercury(I) chloride, Hg₂Cl₂, is commonly known as ______.

  1. ACalomelCorrect answer
  2. BPhosgene
  3. CGalena
  4. DSaltpetre
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Answer

A. Calomel

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Explanation

Calomel is mercury(I) chloride, Hg₂Cl₂, also called mercurous chloride. It contains the dimeric mercury(I) cation Hg₂²⁺ and is used in the calomel reference electrode. Phosgene is COCl₂, galena is PbS, and saltpetre commonly denotes potassium nitrate. These are different compounds.

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