Which of the following aqueous solutions would have a $p H$ greater than 7.0?

1.0 M H C l

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0.5 M N H_{4} C l

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0.25 M H C N

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0.1 M K C N

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Solution

The correct option is C $0.1 M K C N$
$p H$ of salt of $(S B + W A)      > 7 ∴ K C N$
basic in $⇑$
nature $K O H      + H C N$
$S B$

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7.0

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

(a) pH less than 7

(b) pH equal to 7

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