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NTA Abhyas JEE Main2020Chemistrys Block ElementsPractice

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

Options

  1. ASodium and potassium have high values of hydration energy as compared to that of lithium.
  2. BSodium and potassium have higher melting point than that of lithium.
  3. CSodium and potassium have lower melting point than that of lithium.
  4. DSodium and potassium have lower hydration energy than that of lithium.

Correct answer

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

Step-by-step solution

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.

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