ICSE 2005 : SCIENCE Paper 2 (Chemistry) - Question 1 (h) Contextual questioning.

SCIENCE

Paper 2 (Chemistry) - 2005

(One hour and a half)

Question 1
(h) The bleaching action of Chlorine is permanent whereas the bleaching action of Sulphur dioxide is temporary. In this context:-

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36.
(i) Give a reason why Chlorine is not used to bleach silk.

37.
(ii) State the similarity in the use of Sulphur dioxide and Chlorine as bleaching agents.

38.
(iii) Explain the bleaching action of Sulphur dioxide with the help of chemical equations.

39.
(iv) Why is bleaching by Sulphur dioxide only temporary?

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