Which of the following has lowest pH?

M g S O_{4}

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M g C O_{3}

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N a C l

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N a_{2} C_{2} O_{4}

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Solution

The correct option is D $M g S O_{4}$
$M g S O_{4}$ on hydrolysis forms $M g (O H)_{2}$ and $H_{2} S O_{4}$

$M g S O_{4} + 2 H_{2} O \to M g (O H)_{2} + H_{2} S O_{4}$

$M g (O H)_{2}$ is a weak base and $H_{2} S O_{4}$ is strong acid and its solution is highly acidic.

Hence, $M g S O_{4}$ has lowest pH.

While $M g C O_{3}$ on hydrolysis gives weak base $M g (O H)_{2}$ and weak acid $H_{2} C O_{3}$ and $N a C l$ on hydrolysis gives strong base and strong acid thus their pH will be higher than $M g S O_{4}$ .

Also sodium oxalate on hydrolysis gives strong base sodium hydroxide and weak acid oxalic acid thus it's pH will also be not lowest.

Option A is correct.

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