IIT-JEE 2008 · Paper 1 · Chemistry Q49

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ChemistrySingle correct+3 / -1Question 49 of 69

Aqueous solution of $\ce{Na2S2O3}$ on reaction with $\ce{Cl2}$ gives

\ce{Na2S4O6}

\ce{NaHSO4}

NaCl

NaOH

Answer and worked solution

Official answer: B

Chlorine is a strong oxidant and takes thiosulphate all the way to sulphate (the S-S bond is broken; tetrathionate forms only with the milder iodine):
$\ce{Na2S2O3 + 4Cl2 + 5H2O -> 2NaHSO4 + 8HCl}.$

(B)

Topics:Group 16 Balancing redox reactions

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IIT-JEE 2008 · Paper 1, Chemistry question 49