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Introduction and Degree of Hydrolysis

Which of the ...

Question

Which of the following salt solutions ( $0.1 M$ each) will have the lowest pH values?

A

$C a C O_{3}$

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B

$C a (O H)_{2}$

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C

$C a C l_{2}$

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D

$C H_{3} C O O N a$

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Solution

The correct option is C
$C a C l_{2}$

In $C a C O_{3}$ , both the ions $C a^{2 +}$ and $C O_{3}^{2 -}$ are hydrolysed. In $C a C l_{2}$ , only $C a^{2 +}$ ions are hydrolysed. Both $C a (O H)_{2}$ and $C H_{3} C O O N a$ are alkaline in nature. Hence, the lowest pH will be that of $C a C l_{2}$ solution.

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