Which of the following substances will show a chemical changes when kept in open for a few days?

Pizza

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Milk

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Camphor balls

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Pickle

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Solution

The correct options are
A Pizza
B Milk
D Pickle
$∙$ Chemical change brings change in the chemical properties of matter and we get new substances.

$∙$ Pizza and pickle rot and milk becomes sour on keeping in open for some days. The chemical composition of these things changes.

$∙$ The camphor balls become smaller in size as they sublimate, i.e. converts from solid to gas, but the chemical composition remains same.

Hence, only pizza, milk and pickle will show chemical change on keeping in open for some days.

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