Which of the following cations is not hydrolyzed in aqueous solution?
(i) $M g^{2 +}$
(ii) $C a^{2 +}$
(iii) $N a^{+}$
(iv) $K^{+}$

(i), (ii)

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(iii), (iv)

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(i), (ii), (iii), (iv)

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None of the above

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Solution

The correct option is A (i), (ii)
Magnesium hydroxide $(M g (O H)_{2})$ and calcium hydroxide $(C a (O H)_{2})$ are sparingly soluble in water and are also weak bases. Therefore, $M g^{2 +}$ and $C a^{2 +}$ ion do not undergo hydrolysis in aqueous solutions . While $N a^{+}$ and $K^{+}$ undergo hydrolysis as they are strong bases that is $N a O H$ and $K O H$ .

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