Which of the following aqueous solution will have a $p H$ less than $7.0$ ?

K N O_{3}

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N a O H

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F e C l_{3}

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N a C N

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Solution

The correct option is D $F e C l_{3}$
$F e^{3 +}$ ions are hydrolysed to develop acid nature.
$F e^{3 +} + 3 H_{2} O \to F e (O H)_{3} + 3 H^{+}$

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p H

7.0

Give one example each of a salt which gives an aqueous solution having :

(a) pH less than 7

(b) pH equal to 7

p H

p H

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