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Which of the following statements is/are correct? (A) BaCl2 treated with a saturated solution of CaSO4 forms a white precipitate. (B) Li reacts with air to form Li2O and Li3N. (C) Magnesium nitrate crystallises with six molecules of water whereas barium nitrate crystallises as the anhydrous salt. (D) Aqueous solution of Na2SO4 is alkaline due to anionic hydrolysis.
- (A) BaCl2 when treated with saturated solution of CaSO4, forms white ppt.
- (B) Li react with air to form Li2O and Li3N
- (C) Magnesium nitrate crystallises with six molecules of water whereas barium nitrate crystallises as the anhydrous salt.
- (D) Aqueous solution of Na2SO4 is alkaline due to anionic hydrolysis
Correct answer: (C) Magnesium nitrate crystallises with six molecules of water whereas barium nitrate crystallises as the anhydrous salt.
Solution
A: BaCl2 + CaSO4(sat.) -> BaSO4 (white ppt, Ksp ~10⁻¹⁰) precipitates because Ksp(BaSO4) << Ksp(CaSO4). A is correct. B: Li in air forms Li2O (burns in O2) and Li3N (reacts with N2). B is correct. C: Mg(NO3)2 crystallises as hexahydrate; Ba(NO3)2 is anhydrous — correct due to size/charge density. D: SO4²- is conjugate base of strong acid (H2SO4), so it does not hydrolyse; Na2SO4 solution is neutral. D is incorrect. Correct options: A, B, C.
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