Can someone help me with this question?

The Ksp of CaF2 is 3.9 x 10-11. The Ksp of PbBr2 is 2.1 x 10-6. Which is true?
1. CaF2 is more soluble in water than PbBr2
2. PbBr2 is just as soluble in water as CaF2
3. CaF2 is more reactive than PbBr2
4. PbBr2 is more soluble in water than CaF2

Answer:
4.PbBr2 is more soluble in water than CaF2.since it solubility constant is higher than that of CaF2
E=MC 2 ?

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