Which of the following substances, when mixed with water, doesn't leave a residue when passed through a filter paper?

Charcoal powder

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Chalk powder

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Blue vitriol

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Talcum Powder

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Solution

The correct option is C
Blue vitriol

Blue vitriol $C u S O_{4} .5 H_{2} O$ does not leave any residue on filter paper as it forms a true solution (homogeneous mixture) but rest others form a heterogeneous mixture so they leave residue on filter paper.

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