please
Q.The solubility product of BaSO4 at 25 °  C  is 1.0 × 10-9. What would be the concentration of H2SO4 necessary to precipitate BaSO4  from a solution of 0.01 M Ba+2 ions :- 
(1) 10-9                                 (2) 10-8

(3) 10-7                                           (4) 10-6

Option 4 os corre
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Since (I.P)BaSO4 >(Ksp)BaSO4. (Ba^+2) (SO4^-2) > 10^-9. : 0.01? (SO4^-2) > 10^-9 ; (SO4^-2)> 10^-7..
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So option 4 is correct
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4 ..but why
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10-7
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This is the answer

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4 no is correct answer
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