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  4. Aqueous solution of Na2S2O3 on reaction with Cl2 gives

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Q. Aqueous solution of $Na_2S_2O_3$ on reaction with $Cl_2$ gives

IIT JEEIIT JEE 2008The p-Block Elements - Part2

Solution:

Sodium thiosulphate, $Na_2S_2O_3$ gets oxidised by chlorine
water as
$Na_2S2O_3 + 4Cl_2 + 5 H_2O \longrightarrow 2NaHSO_4 + 8HCl$
$FeCl_3$ oxidises $Na_2S_2O_3$ to $Na_2S_4O_6$