Multiple choice

Li resembles Mg mainly due to similarity in sizes of their atoms and ions. The main points of similarity are:

i. Both LiOH and Mg(OH)2 are strong bases. ii. Carbonates of both, on heating, decompose to produce oxides and carbon dioxide. iii. Both react with nitrogen to give covalent nitrides. iv. Both Li and Mg form solid bicarbonates. v. LiCl and MgCl2 are soluble in ethanol. vi. The hydroxides, bicarbonates and fluorides of both Li and Mg are sparingly soluble in water.

  1. i, iii and iv

  2. i, iv and vi

  3. ii, iii and v

  4. ii, v and vi

  5. iv, v and vi
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D Correct answer
Explanation

Li resembles Mg mainly due to similarity in sizes of their atoms and ions. The main points of similarity are:

  1. Both Li and Mg are quite hard.
  2. Both LiOH and Mg(OH)2 are weak bases.
  3. Carbonates of both Li and Mg on heating decompose to produce oxides and carbon dioxide.
  4. Both Li and Mg react with nitrogen to give ionic nitrides.
  5. Nitrates of both Li and Mg decompose on heating to give oxides.
  6. Both Li and Mg do not form solid bicarbonates.
  7. Because of covalent character, LiCl and MgCl2 are soluble in ethanol.
  8. The hydroxides, bicarbonates and fluorides of both Li and Mg are sparingly soluble in water.

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