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Question step three. The solubility of BaSO_cuatro in water is dos.42 x ten -3 gL -1 at 298K. _sp) will be ………………….. (Given molar mass of BaSO₄ = 233g mol -1 ) (a) 1.08 x 10 -14 mol 2 L 2 (b) 1.08 x 10 -12 mol 2 L 2 (c) 1.08 x 10 -10 mol 2 L 2 (d) 1.08 x 10 -8 mol 2 L -2 Answer: (c) 1.08 x 10 -10 mol 2 L 2 BaSO₄ \(\rightleftharpoons\) Ba 2+ + SO₄ 2- K_sp = (s) (s) K_sp = (s) 2

Question 4. pH of a saturated solution of Ca(OH)₂ is 9. The Solubility product (K) of Ca(OH)₂ ……………….. (a) 0.5 x 10 -15 (b) 0.25 x 10 -10 (c) 0.125 x 10 -15 (d) 0.5 x 10 -10 Answer: (a) 0.5 x 10 -15 Ca(OH)₂ \(\rightleftharpoons\) Ca 2+ + 2OH – Given that pH = 9 pOH = 14 – 9 = 5 [p0K = – 1og₁₀[OH – ]] [OH – ] = 10 -pOH [OH – ] =10 -5 M K_sp = [Ca 2+ ] [OH – ] 2

Question 5. Conjugate base for bronsted acids H₂O and HF are ……………… (a) OH – and H₂FH + , respectively (b) H₃O + and F – , respectively (c) OH – and F – , respectively (d) H₃O + and H₂F + , respectively Answer: (c) OH – and F – , respectively

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