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Which of the following is an INCORRECT order of solubility in water?

1. BeSO4 > MgSO4 > CaSO4 > SrSO4 > BaSO4
2. AgF > AgCl > AgBr > AgI
3. PbF2 > PbCl2 > PbBr2 > PbI2
4. BeF2 > MgF2 > CaF2 > SrF2 > BaF2

Correct answer: PbF2 > PbCl2 > PbBr2 > PbI2

Solution

For silver halides (AgX), solubility decreases from F to I (lattice energy effect). For lead halides, PbF2 is actually less soluble than PbCl2 due to high lattice energy of PbF2. The given order PbF2 > PbCl2 >... is therefore incorrect.

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