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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb078

Which of the following are properties shared by lithium and magnesium (but not by the heavier alkali metals)?

  1. ATheir hydrogencarbonates are not obtained as solids
  2. BBoth form superoxides on burning in excess oxygen
  3. CTheir chlorides are deliquescent and crystallise as hydrates
  4. DBoth combine directly with nitrogen to give nitrides

Answer: A, C, D

Li3N and Mg3N2 form by direct combination, neither metal gives a solid bicarbonate, and LiCl and MgCl2 are deliquescent hydrates (, ). Neither forms a superoxide; superoxides are typical of K, Rb and Cs.
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