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Which of the following have been arranged in the order of decreasing oxidation number of sulphur?
(a) \( \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\mathrm{S}_{8} \)
(b) \( \mathrm{SO}^{2+}\mathrm{SO}_{4}^{2-}\mathrm{SO}_{3}^{2-}\mathrm{HSO}_{4}{ }^{-} \)
(c) \( \mathrm{H}_{2} \mathrm{SO}_{5}\mathrm{H}_{2} \mathrm{SO}_{3}\mathrm{SCl}_{2}\mathrm{H}_{2} \mathrm{~S} \)
(d) \( \mathrm{H}_{2} \mathrm{SO}_{4}\mathrm{SO}_{2}\mathrm{H}_{2} \mathrm{~S}\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8} \)
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