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Which of the following happens when NH 4 OH is added gradually to the solution containing 1M A 2+ and 1M B 3+ ions ? Given : K sp [A(OH) 2 ] = 9 × 10 –10 and K sp [B(OH) 3 ] = 27 × 10 –18 at 298 K.

1. B(OH) 3 will precipitate before A(OH) 2
2. A(OH) 2 and B(OH) 3 will precipitate together
3. A(OH) 2 will precipitate before B(OH) 3
4. Both A(OH) 2 and B(OH) 3 do not show precipitation with NH 4 OH

Correct answer: B(OH) 3 will precipitate before A(OH) 2

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