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JEE Main levelOne or more correct optionsDifficulty 2 of 3pt045

Li and Mg show a diagonal relationship. Select the correct statement(s).

ABoth combine directly with nitrogen to form nitrides.
BBoth form peroxides readily on burning in excess oxygen.
CBoth carbonates decompose on heating to give the oxide and carbon dioxide.
DBoth chlorides are deliquescent.

Answer: A, C, D

Li forms

Li X_{3} N

and Mg forms

Mg X_{3} N X_{2}

directly, so A is true. Li and Mg burn to give the normal oxides, not peroxides, so B is false.

Li X_{2} CO X_{3}

and

MgCO X_{3}

decompose to oxide and

CO X_{2}

, and LiCl and

MgCl X_{2}

are deliquescent.

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