Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water
Q. Consider three metal chlorides x, y and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. x, y and z are respectively

(A) AgCl, Hg2Cl2 and PbCl2

(B) CuCl2, AgCl and PbCl2

(C) AlCl3, PbCl2 and BaCl2

(D) MgCl2, AgCl and AlCl3

Correct Answer: (B)

Explanation

Solubility behaviour of metal chlorides depends on lattice energy and hydration energy.

CuCl2 is a transition metal chloride with high hydration energy, hence it is readily soluble in water at room temperature.

AgCl has very high lattice energy and very low hydration energy, therefore it is sparingly soluble in water at room temperature.

PbCl2 has moderate lattice energy and shows significant increase in solubility on heating, hence it is soluble in hot water.

Therefore, x = CuCl2, y = AgCl and z = PbCl2.

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