Which of the following statements is true for all the alkal…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Electronic Configuration and Physical Properties of Alkali Metals Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

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

Their nitrates decomposes on heating to give the corresponding nitrites and oxygen.

Their chlorides are deliquescent and crystallise as hydrates.

They react with water to form hydroxide and hydrogen.

They readily react with halogens to form ionic halides, M + X – .

Text Solution

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The correct answer is:

4 LiNO 3 — → 2Li 2 O + 4NO 2 + O 2

2NaNO 3 — → 2NaNO 2 + O 2 (similar decomposition with the nitrates of K, Rb and Cs)

Only LiCl is deliquescent and crystallises as a hydrate LiCl.2H 2 O

2M + 2H 2 O — → 2M + + 2OH – + H 2 (M = an alkali metal)

Halides of Li are covalent in nature.

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