Sodium thiosulphate (), commonly known as 'hypo', is widely used in photography and analytical chemi — s Block Elements Chemistry Question

💡 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 $2Na_2S_2O_3 + I_2 \rightarrow Na_2S_4O_6 + 2NaI$.