(C) The reactivity of alkali metals with water increases down the group. This is because the ionization potential $(I.P.)$ decreases as we move down t

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(C) The reactivity of alkali metals with water increases down the group. This is because the ionization potential $(I.P.)$ decreases as we move down the group from $Li$ to $Na$. $A$ lower $I.P.$ means the valence electron is more loosely held and can be lost more easily,making the metal more reactive.