Question

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

• A. $Na_2S_4O_6$
• B. $NaHSO_4$
• C. $NaCl$
• D. $NaOH$

Answer 1

Answer: (B)

$NaHSO_4$

Answer 2

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