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Which one of the following has minimum value of cation/anion ratio?

1. NaCl
2. KCl
3. MgCl2
4. CaF2

Correct answer: CaF2

Solution

The cation/anion ratio depends on the charges and sizes of the ions. CaF2 has the smallest cation/anion ratio because calcium (Ca²⁺) has a higher charge and fluoride (F⁻) is small, leading to a lower ratio compared to the other options.

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