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a
HCI
b
HF
c
H2SO4
d
HNO3
answer is B.
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Detailed Solution
Higher the tendency to give H+ ion (i.e. 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 H2SO4>HNO3>HCl>HF.