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Grade: 11
        
A solution which is 10^-3 M each in Mn^2+, Fe^2+, Zn^2+ and Hg^2+ is treated with 10^-16 M sulphide ion. If K base sp of MnS, FeS, ZnS and HgS are 10^-15, 10^-23, 10^-20 and 10^-54 respectively, which one will precipitate first?
a. FeS
b. MgS
c. HgS
d. ZnS
3 years ago

Answers : (1)

Navjyot Kalra
askIITians Faculty
654 Points
							

c) TIPS/Formulae : For precipitation,

Ionic product > solubility product

HgS having the lowest K base sp among the given compounds will precipitate first.

3 years ago
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