Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?
(i) Li
(ii) Na
(iii) K
(iv) Cs

Answers (1)

The answer is the option (i) Li has an extremely high hydrogen enthalpy. So, its reaction with water releases a high amount of energy, most of which is consumed in fusion, vaporization and ionization. Hence, its reaction with water is less vigorous.

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