Which of the following statements is true for all the alkali metals ?A. Their nitrates decomposes on heating to give the corresponding nitrites and oxygen.B. Their chlorides crystallise as hydratesC. They react with water to form hydroxide and hydrogenD. They readily react with halogens to form ionic halides, `M^(+)X^(-)`.

Which of the following statements is true for all the alkali metals ?A

1.	Which of the following statements is true for all the alkali metals ?A. Their nitrates decomposes on heating to give the corresponding nitrites and oxygen.B. Their chlorides crystallise as hydratesC. They react with water to form hydroxide and hydrogenD. They readily react with halogens to form ionic halides, `M^(+)X^(-)`.
Answer» Correct Answer - 3 `(1)4LiNO_(2)rarr2Li_(2)O+4NO_(2)+O_(2)` `2NaNO_(3)rarr2NaNO_(2)+O_(2)(` similar decomposition with the nitrates of `K,Rb` and `Cs)` `(2)` Only `LiCl` is deliquescent and crystallises as a hydrate `LiCl.2H_(2)O` `(3) 2M+2H_(2)Orarr2M^(+)+2OH^(-)+H_(2)(M=` an alkali metal ) `(4)` Halides of `Li` are covalent in nature.

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