Multiple choice

Which of the following matches of ‘properties of alkali metals: trend’ is/are correct?

  1. Reducing ability: Li < Na < K < Rb < Cs
  2. Melting point: Li > Na > K > Rb > Cs
  3. First ionization energy: Li < Na <K < Rb < Cs

  1. 1 and 2

  2. 2 and 3

  3. 3 only

  4. 1, 2 and 3

  5. None of these
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A Correct answer
Explanation

On moving down the group, ability to lose its valence electrons increases (with decrease in ionisation potential), hence, reducing ability of metals increases. Thus, the correct order of reducing ability of alkali metals is Li < Na < K < Rb < Cs. The correct order of melting points of alkali metals is Li (180°C) > Na (98°C) > K (64°C) > Rb (39°C) > Cs (29°C).

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