Which of the following is sparingly soluble in cold water and fairly soluble in hot water?

Correct option is A

Lead chloride (PbCl₂) is sparingly soluble in cold water but dissolves significantly better in hot water. The solubility of PbCl₂ increases with temperature because heat provides energy to overcome the lattice energy of the ionic solid, enhancing its dissolution.
PbSO₄ (Lead Sulfate): Lead sulfate is highly insoluble in both cold and hot water
Pb (NO₃) ₂ (Lead Nitrate): Lead nitrate is highly soluble in both cold and hot water.
Additional Knowledge
Lead (II) chloride (PbCl2) is an inorganic compound which is a white solid under ambient conditions. It is poorly soluble in water. Lead(II) chloride is one of the most important lead-based reagents. It also occurs naturally in the form of the mineral cotunnite.
Lead(II) nitrate is an inorganic compound with the chemical formula Pb(NO 3)2. It commonly occurs as a colourless crystal or white powder and, unlike most other lead(II) salts, is soluble in water.
Lead (II) sulfate (PbSO4) is a white solid, which appears white in microcrystalline form. It is also known as fast white, milk white, sulfuric acid lead salt or anglesite. It is often seen in the plates/electrodes of car batteries, as it is formed when the battery is discharged (when the battery is recharged, then the lead sulfate is transformed back to metallic lead and sulfuric acid on the negative terminal or lead dioxide and sulfuric acid on the positive terminal). Lead sulfate is poorly soluble in water.