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If equal volumes of AB 2 and XY (both are salts) aqueous solutions are mixed, which of the following combination will give a precipitate of AY 2 at 300 K? (Given K sp (at 300 K) for AY 2 - = 5.2 × 10 –7 )

1. 2.0 × 10 –2 M AB 2 , 2.0 × 10 –2 M XY
2. 2.0 × 10 –4 M AB 2 , 0.8 × 10 –3 M XY
3. 3.6 × 10 –3 M AB 2 , 5.0 × 10 –4 M XY
4. 1.5 × 10 –4 M AB 2 , 1.5 × 10 –3 M XY

Correct answer: 2.0 × 10 –2 M AB 2 , 2.0 × 10 –2 M XY

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