NEET Chemistry The s-Block Elements Questions Solved


Sodium and potassium react with water much more vigorously than lithium because :

(A) Sodium and potassium have high values of hydration energy as compared to that of lithium.

(B) Sodium and Potassium have a higher melting point than that of lithium.

(C) Sodium and potassium have a lower melting point than that of lithium.

(D) Sodium and potassium have lower hydration energy than that of lithium.

(C)

      When sodium and potassium react with water, the heat evolved causes them to melt, giving a

       larger area of contact with water, lithium, on the other hand, does not melt under these conditions

       and thus reacts more slowly.

                                    LiMelting point °C 180                       Na98                              K64.

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