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In which of the following arrangements the given sequence is not strictly according to the property indicated against it
[AIPMT (Mains) 2012]
(a) \( \mathrm{HF}\mathrm{HCl}\mathrm{HBr}\mathrm{HI} \); increasing acidic strength
(b) \( \mathrm{H}_{2} \mathrm{O}\mathrm{H}_{2} \mathrm{~S}\mathrm{H}_{2} \mathrm{Se}\mathrm{H}_{2} \mathrm{Te} \); increasing \( p K_{a} \) values
(c) \( \mathrm{NH}_{3}\mathrm{PH}_{3}\mathrm{AsH}_{3}\mathrm{SbH}_{3} \); increasing acidic character
(d) \( \mathrm{CO}_{2}\mathrm{SiO}_{2}\mathrm{SnO}_{2}\mathrm{PbO}_{2} \); increasing oxidizing power
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