Which of the following will have highest pH ?

$0.1 M N H_{4} B r$

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$0.1 M (N H_{4}) S O_{4}$

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$0.1 M N H_{4} N O_{3}$

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$0.1 M (N H_{4})_{3} P O_{4}$

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Solution

The correct option is D
$0.1 M (N H_{4})_{3} P O_{4}$

In case of (a), (b) and (c) pH < 7 due to cationic $(N H_{4}^{+})$ hydrolysis.
In case of $(N H_{4})_{3} P O_{4},$ both the cation and anion undergo hydrolysis. $p H \approx 7$

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