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(C) The reactivity of alkali metals with water increases as we move down the group from $Li$ to $Cs$. This trend is due to the increase in the electro

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$Rb$

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(C) The reactivity of alkali metals with water increases as we move down the group from $Li$ to $Cs$. This trend is due to the increase in the electropositive character and the decrease in ionization enthalpy down the group. The order of reactivity is $Li Therefore,$Rb$ (Rubidium) reacts most vigorously with water among the given options.

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

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