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MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions

If the solubility of calcium fluoride in pure water is x mol/L, its solubility product is (AFMC 2009) (a) 2x

B.2x2✓ Correct
C.4x3
D.x2
Explanation

The solubility product can be found as- 2 2 2+ 2 sp 2 sp 3 sp CaF Ca 2F K =[Ca ][F ] K =[x][2x] K = 4x 12. Two acids A and B have 4 and 6, then (CPMT 2009) (a) A is 4/6 times stronger than B. (b) A is 100 times stronger than B. (c) A is 6/4 times stronger than B. (d) B is 10 times stronger than A. We know that- a a a 4 a b b b 6 b a b pK = logK 4= logK K =10 Similarly,pK = logK 6= logK K =10 K =100.K Clearly, a K is 100 times stronger than b K a pK IONIC EQUILIBRIUM 54

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