(A) The reaction of alkali metals like $Na$ and $K$ with water is highly exothermic in nature.$2Na(s) + 2H_2O(l) \to 2NaOH(aq) + H_2(g) + \text{Heat}$

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(A) The reaction of alkali metals like $Na$ and $K$ with water is highly exothermic in nature.$2Na(s) + 2H_2O(l) \to 2NaOH(aq) + H_2(g) + \text{Heat}$$2K(s) + 2H_2O(l) \to 2KOH(aq) + H_2(g) + \text{Heat}$Since heat is released during these reactions,they are classified as exothermic.