Q30 of 79 Page 3

Write short notes on the bleaching action of sulphur dioxide.

a) Sulphur dioxide bleaches the vegetable colours in the presence of moisture.b) It bleaches the vegetable colours by reduction. It removes oxygen from coloured material.c) Its bleaching action is temporary, because atmospheric oxygen again oxidises the bleached article back to its original colour.d) SO2 is used to bleach delicate fabrics like wool, silk etc.

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28 (i) What is the colour of potassium dichromate solution?
(ii) What is the colour of Cr3+ ion?
(iii) What property of SO2 is responsible for bringing change of colour of potassium dichromate? 29 How is chloride of lime chemically different from calcium chloride? Why does chloride of lime gradually lose its chlorine when kept exposed to air? 31 (a) What is the atomicity of sulphur?
(b) How do you bring the change of rhombic sulphur to monoclinic sulphur and vice versa?
(c) What is the action of conc. HNO3 on sulphur? 32 Name two metals used in making fuse wires.