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Q.

For which alkali metal, hydrogen gas is not necessarily liberated on reaction with water?

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a

Li

b

Mg

c

Na

d

Cs

answer is A.

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Detailed Solution

For lithium hydrogen gas is not necessarily liberated on reaction with water.Because the boiling temperature of lithium is grater.

All alkali metals require 673 K, while Li requires 1073K

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