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Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

1. SrCl2
2. BaCl2
3. MgCl2
4. CaCl2

Correct answer: BaCl2

Solution

BaCl2 will have the highest pH because Ba²⁺ is a weaker Lewis acid compared to Mg²⁺, Ca²⁺, and Sr²⁺, leading to less hydrolysis of water and a higher pH.

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