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BITSAT 2019
Exam
BITSAT
Year
2019
Subject
Chemistry
Chapter
s Block Elements

BITSAT 2019 · Chemistry · s Block Elements

The correct order of mobility of alkali metal ions in aqueous...

The correct order of mobility of alkali metal ions in aqueous solution is-

Options

  1. ALi+>Na+>K+>Rb+{Li}^{+} > {Na}^{+} > K^{+} > {Rb}^{+}
  2. BNa+>K+>Rb+>Li+{Na}^{+} > K^{+} > {Rb}^{+} > {Li}^{+}
  3. CK+>Rb+>Na+>Li+K^{+} > {Rb}^{+} > {Na}^{+} > {Li}^{+}
  4. DRb+>K+>Na+>Li+{Rb}^{+} > K^{+} > {Na}^{+} > {Li}^{+}

Correct answer

D. Rb+>K+>Na+>Li+{Rb}^{+} > K^{+} > {Na}^{+} > {Li}^{+}

Step-by-step solution

Mobility of alkali ions in aqueous solution ∝1sizeofhydratedion∝ \dfrac{1}{ size of hydrated ion }

The mobility of alkali ions is inversely proportional to the size of ion in hydrated state, because bigger ion can't move faster. Also, small ion get hydrolysed to large exent due to which its size get increased. In other words, smaller ion will form hydrated ion of larger size.

Hence, correct order of mobility is

Rb+>K+>Na+>Li+{Rb}^{+} > K^{+} > {Na}^{+} > {Li}^{+}

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