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Which of the following salts when dissolving in water, will give a solution with pH less than 7 at 298 K

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KCN

C H_{3} COONa

NaBr

N H_{4} Cl

answer is D.

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Detailed Solution

When

N H_{4} Cl

is dissolved in water, it gives a solution with pH less than 7 at 298K.
The table shows the information related to ions present in the salt
Matrix:

Salt	Acid used	Base used	Type of combination	pH of salt
KCN	HCN	KOH	Weak acid+strong base	>7
$C H_{3} COONa$	$C H_{3} COOH$	NaOH	Weak acid+strong base	>7
NaBr	HBr	NaOH	Strong acid+strong base	=7
$N H_{4} Cl$	HCl	$N H_{4} OH$	Strong acid+weak base	<7

From the above table, we can say that

N H_{4} Cl

is salt which gives pH less than 7.

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