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Nitric Acid

HClO4, HNO3 a...

Question

$H C l O_{4}, H N O_{3}$ and $H C l$ are all very strong acids in aqueous solutions. In glacial acetic acid medium, their acid strength is such that:

A

H C l O_{4} > H N O_{3} > H C l

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B

H N O_{3} > H C l O_{4} > H C l

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C

H C l > H C l O_{4} > H N O_{3}

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D

H C l > H C l O_{4} \sim H N O_{3}

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Solution

The correct option is A $H C l O_{4} > H N O_{3} > H C l$
$H C l O_{4} > H N O_{3} > H C l$
$H C l O_{4}$ is most acidic. Generally, $H C l$ is more acidic than $H N O_{3}$ but in glacial acetic medium, there are $H^{+}$ ions already present and they hamper the acidity of $H C l$ .

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