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  • During the detection of  with , when Ammonia solution is added to the pre

During the detection of Hg_2^{2+} with HCl, when Ammonia solution is added to the precipitate, there is a black precipitate formed. This black coloration is due to

Option: 1

Hg(NH_2)Cl


Option: 2

Hg


Option: 3

Hg_2Cl_2


Option: 4

None of these


Answers (1)

best_answer

As we have learnt,

Hg^{2+}_{2}is precipitated with HCl in the form of white precipitate. Upon adding Ammonia solution to the precipitate, black coloration is obtained. This is due to the formation of Hg obtained as a result of disproportionation of Hg_2^{2+}. The other product is Mercuric amidochloride. The reaction occurs as 

Hg_{2}Cl_{2} + NH_{3}\rightarrow Hg(NH_{2})Cl + Hg (black\: ppt)

Black precipitate confirms the presence  Hg^{2+}_{2}

Hence, the correct answer is Option (2)

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