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Subject :NSO    Class : Class 7

Preeti burnt a fibre X. She found that X is selfextinguishing and leaves a dull black bead which crushes easily to powder. Which of the following could be fibre X?

DBoth A and B

Ans 1:

Class : Class 7

Ans 2:

Class : Class 9

Ans 3:

Class : Class 7

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