Q.

Which of the following aqueous solution will have a pH less than 7.0 ?

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a

KNO3

b

NaOH

c

FeCl3

d

NaCN

answer is C.

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Detailed Solution

Salt of strong acid weak base gives an acidic solution due to cationic hydrolysis.Fe3+ ions are hydrolysed to develop acidic nature.
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Which of the following aqueous solution will have a pH less than 7.0 ?