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Question

A metal gives two chlorides ‘A’ and ‘B’. ‘A’ gives black precipitate with NH4OH and ‘B’ gives white. With KI ‘B’ gives a red precipitate soluble in excess of KI. ‘A’ and ‘B’ are respectively :



A

HgCl2 and Hg2Cl2

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B

Hg2Cl2 and HgCl2

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C

HgCl2 and HgCl

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D

None of these

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Solution

The correct option is C

Hg2Cl2 and HgCl2


'A' is Hg2Cl2 and 'B' is HgCl2

HgCl2+2KIHgI2+2KCl

Red

HgI2+2KIK2HgI4Soluble


Chemistry

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