bleaching action of sulphur dioxide

Bleaching Action of Sulphur Dioxide - Dry sulphur dioxide does not have any bleaching action. However, if the gas is moist, or if the object to be bleached is moist, then bleaching takes place. Usual..

Dry sulphur dioxide does not have any bleaching action. However, if the gas is moist, or if the object to be bleached is moist, then bleaching takes place. Usually only delicate articles such as coloured flowers, silk, wool etc., are..

Sulphur and their Properties..

Sulphur dioxide is a strong reducing agent. In the presence of moisture SO 2 liberated nascent hydrogen and reduction takes place by addition of hydrogen. Example: Potassium dichromate, potassium permanganate and nitric acid are reduced by the action of SO 2 by removal..

* Sulphur dioxide was known from ancient times and Romans used it as a general cleansing agent. * In 1770 , J.Priestly prepared the gas by the action of hot conc. Sulphuric acid on mercury and called it sulphurous aci..

* It is a powerful germicide and insecticide and hence it is used a household fumigant. * It can bleach delicate fibres. * It undergoes easy liquefaction and vaporization and hence it is used as refrigerent in cold storage plant..

The various uses of sulphur dioxide are: 1) In the manufacturing of sulphuric acid, sulphites, and hydrogen sulphite. 2) In the sugar industry for refining and decolorizing sugar. 3) For refining kerosene, and other petroleum products. 4) As a disinfectant. 5) As a fum..

Uses of Sulphur Dioxide - It is a powerful germicide and insecticide and hence it is used a household fumigant. It can bleach delicate fibres. It undergoes easy liquefaction and vaporization and hence it is used as refrigerent in cold storage plants. It is used in the ..

It has a pungent, suffocating smell of burning sulphur. It turns a) Blue litmus paper red. b) Methyl orange pink. c) Pink phenolphthalein colorless. The purple solution of potassium permanganate gets decolorized by sulphur dioxide. It changes the color of acidified..

Chemical Properties of Sulphur Dioxide - Reducing reactions - In the presence of moisture, sulphur dioxide acts as a powerful reducing agent. On reaction with water it forms sulphurous aci..