Chem que 1.

Solution:
Option D is correct: Zn
The metal M in the salt is zinc.
An aqueous solution of colorless zinc sulfate (ZnSO4) gives a white ppt. of Zn(OH)2​ with NH4​OH.
ZnSO4​+2NH4​OHZn(OH)2​+(NH4​)2​SO4

Zn(OH)2 is soluble in excess of NH4​OH due to the formation of ammonium zincate (NH4​)2​ZnO2​.
Zn(OH)2​+2NH4​OH(NH4​)2​ZnO2​+2H2​O

On passing H2​S through this solution a white ppt. of ZnS is formed.
(NH4​)2​ZnO2​+ H2​S→ZnS+2NH4​OH



 

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