JEE Advanced2008Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Aqueous solution of Na ₂ ~S ₂ O ₃ on reaction with Cl ₂ gives

Options

ANa ₂ ~S ₄ O ₆
BNaHSO ₄
CNaCl
DNaOH

Correct answer

B. NaHSO ₄

Step-by-step solution

Sodium thiosulphate, Na ₂ ~S ₂ O ₃ gets oxidised by chlorine water. Na ₂ ~S ₂ O ₃+4 Cl ₂+5 H ₂ O 2 NaHSO ₄+8 HCl Na ₂ ~S ₂ O ₃ gets oxidised by FeCl ₃ into Na ₂ ~S ₄ O ₆ 2 Na ₂ ~S ₂ O ₃+2 FeCl ₃ Na ₂ ~S ₄ O ₆+2 FeCl ₂+2 NaCl Further, Na ₂ ~S ₂ O ₃ decomposes on treatment with dilute acids Na ₂ ~S ₂ O ₃+2 HCl 2 NaCl + SO ₂+ S + H ₂ O

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