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NTA Abhyas JEE Main2020ChemistrySolutionsPractice

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

Options

  1. ATheir nitrates decomposes on heating to give the corresponding nitrites and oxygen
  2. BTheir chlorides are deliquescent and crystallize as hydrates.
  3. CThey react with water to form hydroxide and hydrogen.
  4. DThey react with halogens to form only ionic halides M + X - .

Correct answer

C. They react with water to form hydroxide and hydrogen.

Step-by-step solution

A 4 LiNO 3 → 2 Li 2 O + 4 NO 2 + O 2 2 NaNO 3 → 2 NaNO 2 + O 2 similar decomposition with the nitrates of K, Pb and Cs ) B Only LiCl is deliquescent and crystallises as a hydrate LiCl . 2 H 2 O C 2 M + 2 H 2 O → 2 M + + 2 OH − + H 2 ( M is an alkali metal) D Halides of Li are covalent in nature.

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