The purity of gold can be checked by its :

melting point

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boiling point

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composition

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all of above

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Solution

The correct option is D all of above
Gold is a pure substance which consists of only type of atoms or molecules. A pure substance does not change its composition over time. Also, the melting and boiling points of pure substance are constant. Hence, purity can be checked by melting point, boiling point and composition.

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The purity of a substance can be tested by checking its _________ or __________.

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