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pH of a saturated solution of Ca(OH)2 is 12. Its solubility product is :

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pH of a saturated solution of Ca(OH)2 is 12. Its solubility product is : 

(A) 10–6 

(B) 4 × 10–6 

(C) 5 × 10–7 

(D) None of these

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Correct option: (C) 5 × 10–7

Explanation: 

pH = 12 so [OH– ] = 10–2 M

so Ksp = [Ca2+] [OH– ]2 

= (5 × 10–3) (10–2) 2 = 5 × 10–7

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