Q71 / 199 · NEET 2008 (Mains) · Chemistry

The sequence of ionic mobility in aqueous solution is

  • A
    $\mathrm{Na}^{+}>\mathrm{K}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$
  • B
    $\mathrm{K}^{+}>\mathrm{Na}^{+}>\mathrm{Rb}^{+}>\mathrm{Cs}^{+}$
  • Correct answer
    C
    $\mathrm{Cs}^{+}>\mathrm{Rb}^{+}>\mathrm{K}^{+}>\mathrm{Na}^{+}$
  • D
    $\mathrm{Rb}^{+}>\mathrm{K}^{+}>\mathrm{Cs}^{+}>\mathrm{Na}^{+}$

Solution

More the charge density of ion, more will be the ion-dipole interaction, so more will be hydration of ion and hence less will be the ionic mobility.

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

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