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The correct order of conductivity of ions in water is:

1. Na+ > K+ > Rb+ > Cs+
2. Cs+ > Rb+ > K+ > Na+
3. K+ > Na+ > Cs+ > Rb+
4. Rb+ > Na+ > K+ > Li+

Correct answer: Cs+ > Rb+ > K+ > Na+

Solution

In water, larger bare cations are less hydrated and move faster, so conductivity order is Cs+ > Rb+ > K+ > Na+. The correct option is Cs+ > Rb+ > K+ > Na+.

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