Ans. Ksp of NiCO3 = 1.42 * 10^ -7
Na2CO3 = 2Na+ + CO3 2-
2 * 0.002 0.002
NiCl2 = Ni 2+ + 2Cl-
0.15 2 * 0.15
[CO32-] = 0.002 M
[Ni2+] = 0.15
[Ni2+] [CO3 2-] = 0.15 * 0.002 = 3.0 * 10^-4 M^2
ionic product of NiCO3 is more than that of Ksp and hence it will precipitated
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