Mercurous chloride exists in the form of

• A

  $\mathrm{Hg}^{+}$
• Correct answer
  B

  $\mathrm{Hg}_2^{2+}$
• C

  $\mathrm{Hg}^{2+}$
• D

  $\mathrm{Hg}_3{ }^{2+}$

Hence, the correct answer is option: 'B'.