Which of the following happens when NH4OH is added gradually to the solution containing 1 M A2+ and 1 M B3+ ions ? Given : Ksp[A(OH)2] = 9 × 10–10 and Ksp[B(OH)3] = 27 × 10–18 at 298 K. (A) Both A(OH)

Question

Which of the following happens when NH4OH is added gradually to the solution containing 1 M A2+ and 1 M B3+ ions ? Given : Ksp[A(OH)2] = 9 × 10–10 and Ksp[B(OH)3] = 27 × 10–18 at 298 K.

(A) Both A(OH)2 and B(OH)3 do not show precipitation with NH4OH
(B) A(OH)2 will precipitate before B(OH)3
(C) A(OH)2 and B(OH)3 will precipitate together
(D) B(OH)3 will precipitate before A(OH)2 | JEE(Main) 2025 | DATE : 23-01-2025 (SHIFT-1) | PAPER-1 | CHEMISTRY PAGE # 4

Prashant Kotian · Accepted Answer

Correct answer: D. A(OH)2 A+ + 2OH– A(OH)2 will just start ppt. when QP = 1 × [OH–]2 = 9 × 10–10 NH4OH Solution O 1M A2+ & 1M B3+ [OH–] = 3 × 10–5 mol/L  B(OH)3 will just start ppt when 1 × [OH–]3 = 27 × 10–18 [OH–] = 3 × 10–6 mol/L  B(OH)3 will precipitate before A (OH)2.

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