Multiple choice

Arrange the following in order of decreasing Ionic mobility in protic solvent.

  1. Li+ > Na+ > K+ > Rb+ .

  2. Li+ > Na+ < K+ > Rb+ .

  3. Rb+ > K+ > Na+ > Li+ .

  4. Rb+ > K+ < Na+ > Li+ .

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C Correct answer
Explanation

In protic solvent higher the value of ionic potential , highly hydrate  the cation is and therefore lower will be the mobilty . The ionic potential order is given by - Li+ > Na+ > K+ > Rb+ , therefore order of mobility is  - Rb+ > K+ > Na+ > Li+ .