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What is a pure substance ? Give its one ...

What is a pure substance ? Give its one characteristic.

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A pure substance is the one which cannot be separated into smaller parts by any physical methods. It may be either a pure element (e.g. sodium) or a pure compound (e.g. calcium carbonate).
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DINESH PUBLICATION-MATTER IN OUR SURROUNDINGS -Very Short Answer Questions
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  7. What is a pure substance ? Give its one characteristic.

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