Duration: 3:27

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\( \mathrm{S}_{2} \mathrm{O}_{3}{ }^{2-} \) ion is oxidized by \( \mathrm{S}_{2} \mathrm{O}_{8}{ }^{2-} \) ion, the products
P are \( \mathrm{S}_{4} \mathrm{O}_{6}{ }^{2-} \) and \( \mathrm{SO}_{4}{ }^{2-} \) ions. What volume of \( 0.25 \mathrm{M} \)

W thiosulphate solution would be needed to reduce 1 g of \( \mathrm{K}_{2} \mathrm{~S}_{2} \mathrm{O}_{8} \) ? \( (\mathrm{K}=39) \)
(1) \( 36.92 \mathrm{ml} \)
(2) \( 32.69 \mathrm{ml} \)
(3) \( 29.63 \mathrm{ml} \)
(4) \( 62.93 \mathrm{ml} \)
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