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Q.
The strongest of the following acids, is
Chhattisgarh PMTChhattisgarh PMT 2004
Solution:
In the gaseous state the hydride are essentially covalent but in dilute aqueous solution the three hydrogen halides $HCl$, $H B r, H I$, are essentially fully ionised and are thus strong acids.
$H I$ is most strongly ionised and is thus the strongest acid.
$H F$ is the weakest acid among them, its ionisation constant being only $7.2 \times 10^{-4}$.
This weakly acidic nature of $H F$ is largely due to very strong $H-F$ bond.
Decreasing order of the strength of acid is as follows $H I>H B r>H C l>H F$