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  4. Which of the following is the weakest acid?

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Q. Which of the following is the weakest acid?

UPSEEUPSEE 2009

Solution:

Higher the tendency to give $H ^{+}$ ion (ie, to undergo ionisation), stronger will be the acid or vice-versa.

$HF$ has poor tendency to give $H ^{+}$ ion, hence it is the weakest acid among the given.

The order of acidity of given acids is

$H _{2} SO _{4}> HNO _{3}> HCl > HF$