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  4. Which one of the following will react most vigorously with water?

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Q. Which one of the following will react most vigorously with water?

AIEEEAIEEE 2012The s-Block Elements

Solution:

Reactivity with water increases on moving down the Goup from Li to Cs as $Li < Na < K < Rb < Cs$. This is due to increase in electropositive character. Hence Rb reacts most vigorously with wate