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A mixture of 100 m mol of Ca(OH) 2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH – in resulting solution, respectively, are : (Molar mass of Ca (OH) 2 , Na 2 SO 4 and CaSO 4 are 74, 143 and 136 g mol –1 , respectively; K sp of Ca(OH) 2 is 5.5 × 10 –6 )

1. 13.6g, 0.28 mol L –1
2. 13.6g, 0.14 mol L –1
3. 1.9g, 0.28 mol L –1
4. 1.9g, 0.14 mol L –1

Correct answer: 1.9g, 0.28 mol L –1

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