Analytical ChemistryHard
Question
A metal M and its compound can give the following observable changes in a sequence of reactions, M 
The metal M can be :
The metal M can be :Options
A.Mg
B.Pb
C.Zn
D.Sn
Solution
4Zn + 10H+ + NO3- → 4Zn2+ + NH4+ + 3H2O.
Zn2+ + 2OH- → Zn(OH)2↓ (white) ; Zn(OH)2 + 2OH- → [Zn(OH)4]2-.
[Zn(OH)4]2- + H2S → ZnS ↓ (white) + 2OH- + 2H2O.
Zn2+ + 2OH- → Zn(OH)2↓ (white) ; Zn(OH)2 + 2OH- → [Zn(OH)4]2-.
[Zn(OH)4]2- + H2S → ZnS ↓ (white) + 2OH- + 2H2O.
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