Which of the following mixtures will be the most difficult to separate?

Iron filings (powder) + sand

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Sand + water

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Sawdust + stones

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Nitrogen + hydrogen

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Solution

The correct option is D Nitrogen + hydrogen
Nitrogen and hydrogen mixture (a gaseous mixture) is difficult to separate since it has to be cooled to very low temperatures to convert into liquids below their boiling points and then distilling them.

Hence, the correct option is $(D)$ .

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