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An unknown composition of a mixture of carbon
\( \mathrm{P} \) disulphide and hydrogen sulphide was burnt in

W. sufficient amount of oxygen. The resulting gases found to exert a pressure of 1.97 atm in a 201 vessel - at \( 400 \mathrm{~K} \). The gaseous mixture required \( 2.8 \mathrm{M} \) - iodine solution and \( 250 \mathrm{ml} \) of it was required to - reach the end point forming \( \mathrm{I}^{-} \). Calculate the mole - fraction of \( \mathrm{CS}_{2} \) in the original mixture.
(a) 0.2
(b) 0.4
(c) 0.6
(d) 0.8
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