pBlock ElementsII 2 Question 17
17. The following acids have been arranged in the order of decreasing acidic strength. Identify the correct order. $\mathrm{ClOH}$ (I), $\mathrm{BrOH}$ (II), $\mathrm{IOH}$ (III)
(1996, 1M)
(a) I $>$ II $>$ III
(b) II $>$ I $>$ III
(c) III $>$ II $>$ I
(d) I $>$ III $>$ II
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Solution:
- Among oxyacids of halogens, if there are same number of oxygens bonded to central atom, higher the electronegativity of halogen, stronger the acid. Hence,
$$ \mathrm{IOH}<\mathrm{BrOH}<\mathrm{ClOH} $$
