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Which of the following statements about Group 1 and Group 2 chemistry are CORRECT? (A) Adding BaCl2 to a saturated CaSO4 solution gives a white precipitate. (B) Li reacts with O2 and N2 to form Li2O and Li3N respectively. (C) Magnesium nitrate crystallises with water of crystallisation while barium nitrate crystallises as anhydrous salt. (D) Aqueous Na2SO4 solution is alkaline due to anionic hydrolysis.
- (A) BaCl2 added to saturated CaSO4 solution gives milky precipitate.
- (B) Li reacts with O2 and N2 to form Li2O and Li3N.
- (C) Mg(NO3)2 crystallises as hexahydrate while Ba(NO3)2 is anhydrous.
- (D) Aqueous Na2SO4 is alkaline due to anionic hydrolysis.
Correct answer: (B) Li reacts with O2 and N2 to form Li2O and Li3N.
Solution
A: BaCl2 + CaSO4(aq) -> BaSO4 (white ppt) + CaCl2; this is correct. B: Li + O2 -> Li2O and Li + N2 -> Li3N; both correct and anomalous for Group 1. C: Mg(NO3)2·6H2O vs anhydrous Ba(NO3)2; correct. D: Na2SO4 is a salt of strong acid + strong base; no hydrolysis; solution is neutral, not alkaline — D is incorrect. Among given options, B and C are definitely correct; if single-best answer, B is the most distinctive (anomalous behaviour of Li).
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