The average oxidation state of sulphur in \( \mathrm{Na}_{2} \mathr...

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The average oxidation state of sulphur in \( \mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6} \) is
(a) \( +2.5 \)
(b) \( +2 \)
(c) \( +3.0 \)
(d) \( +3.5 \)
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