Q57 / 180 · NEET 2017 · Chemistry

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salt are put under an electric field?

  • A
    Na
  • B
    K
  • C
    Rb
  • Correct answer
    D
    Li

Solution

Li+ being smallest, has maximum charge density.

∴ Li+ is most heavily hydrated among all alkali metal ions. Effective size of Li+ in aq. solution is therefore, largest.

∴ Moves slowest under electric field.

Hence, the correct answer is option: 'D'.

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