NEET | 2016Hydrogen and its compoundHard

Question

MY and NY3, two nearly insoluble salts, have the same Ksp values of 6.2 ×10-13 at room temperature. Whichstatement would be true in regard to MY and NY3 ?

Options

A.

The molar solubilities of MY and NY3 in water are identical.

B.

The molar solubility of MY in water is less than that of NY3.

C.

The salts MY and NY3 are more soluble in 0.5 M KY than in pure water.

D.

The addition of the salt of KY to solution of MY and NY3 will have no effect on their solubilities.

Solution

MY insoluble salt Ksp = s2
MY(s) ⇌ M+(aq) + Y-(aq)
NY3 insoluble salt Ksp = 4s3
NY3(s) ⇌ N+(aq) + 3Y-(aq)
∴ S(MY) = 6.2 × 10-13=7.8+10-7
Solubility values
∴ S(MY3) = 6.2×10-1341/3=5.2×10-5
∴ S(MY) < S(NY3)

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