Sodium thiosulphate (), commonly known as 'hypo', is widely used in photography and analytical chemi — s Block Elements Chemistry Question
Question
Sodium thiosulphate ($Na_2S_2O_3$), commonly known as 'hypo', is widely used in photography and analytical chemistry. In the reaction of 'hypo' with iodine ($I_2$), what is the formula of the primary oxidized sodium-sulfur product?
Answer: B
💡 Solution & Explanation
Sodium thiosulphate acts as a reducing agent. When it reacts with Iodine ($I_2$), the iodine is reduced to iodide ($NaI$), and the thiosulphate is oxidized to Sodium tetrathionate ($Na_2S_4O_6$). The reaction is $2Na_2S_2O_3 + I_2 \rightarrow Na_2S_4O_6 + 2NaI$.
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