Q.

Which of the following acid has a negative pka value

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a

CF3COOH

b

HCl

c

Picric acid

d

HF

answer is B.

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Detailed Solution

HClO4,  HI,  H2SO4,  HBr,  HCl,  HNO3 are some very important examples of strong acids in aqueous solution.The acid must be stronger in aqueous solution than a hydronium ion, so its Pka must be lower than that of hydronium ion.∴ strong acids have negative Pka value.
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