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 NH4OH.
ZnSO4+2NH4OHZn(OH)2+(NH4)2SO4
Zn(OH)2 is soluble in excess of NH4OH due to the formation of ammonium zincate (NH4)2ZnO2.
Zn(OH)2+2NH4OH(NH4)2ZnO2+2H2O
On passing H2S through this solution a white ppt. of ZnS is formed.
(NH4)2ZnO2+ H2S→ZnS+2NH4OH
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 NH4OH.
ZnSO4+2NH4OHZn(OH)2+(NH4)2SO4
Zn(OH)2 is soluble in excess of NH4OH due to the formation of ammonium zincate (NH4)2ZnO2.
Zn(OH)2+2NH4OH(NH4)2ZnO2+2H2O
On passing H2S through this solution a white ppt. of ZnS is formed.
(NH4)2ZnO2+ H2S→ZnS+2NH4OH