A) sulphate ion
B) sulphite ion
C) tetrathionate ion
D) sulphide ion
Correct Answer: C
$ 2Na_2S_2O_3+I_2\to \underset{\begin{smallmatrix} Sodium \\ tetrathionate \end{smallmatrix}}{\mathop{Na_2S_4O_6}}+2NaI $
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