When about 200 g of sodium thiosulphate (hypo) is dissolved in about 2 L of clean water taken in the tank and about 1 to 2 ml of concentrated sulphuric acid is added to the water, it is observed that:
We will find fine microscopic sulphur particles precipitating in about 2 and 3 minutes due to the reaction between sulphuric acid sodium thiosulphate.
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[C] Sulphur particles start precipitating in about 2 and 3 minutes