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Lakhmir Singh & Manjit Kaur - Chemistry

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Q. 313.7( 23 Votes )

Give one example

Class 9th Lakhmir Singh & Manjit Kaur - Chemistry 1. Matter in Our Surroundings

Answer :

Some time we observe that the marks of chalk on the black board could not be wiped out easily after a long time. This happens because of the diffusion of particles of chalks with the particles of black-board and marks of chalk could not be wiped out.

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