Question

which pair doesn't show diffusion
(1). chlorine and oxygen
(2). chlorine and bromine
(3). water and oxygen
(4).salt and sand​

Answer 1

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Answer 2

The pair which does not show any kind of diffusion is salt and sand.

These particles are solid and does not melt when they come in contact with water or any other liquid substance.

Both have unique identities and hence cannot diffuse when mixed together by any means. Salt and sand is hence the right answer to this question.

They never diffuse.