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Which of the following concentration term(s) represents solubility of BaF2 in a solution of Ba(NO3)2?

(a) 2[NO-3]

(b) \(\frac{1}{2}\)[F-]

(c) [Ba2+]

(d) [F-]

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Answer is  (b) \(\frac{1}{2}\)[F-]

Ba(NO3)gives NO3- and Ba2+ ions, hence Ba2+ ion increases. To keep Ksp constant, [F-] decreases. Thus, it is represented as \(\frac{1}{2}\)[F-]

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