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  3. Chemistry
  4. Give reasons for, ''The colour of mercurous chloride, Hg2 Cl2, changes from white to black when treated with ammonia.''

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Q. Give reasons for, ''The colour of mercurous chloride, $Hg_2 Cl_2$, changes from white to black when treated with ammonia.''

IIT JEEIIT JEE 1988Organic Chemistry – Some Basic Principles and Techniques

Solution:

Mercurous chloride changes from white to black when treated with ammonia due to formation of metallic $Hg$.