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Q.

Which of the following is not an example of a pure substance?

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a

Air

b

Gold

c

Oxygen

d

Sodium chloride

answer is C.

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Detailed Solution

  • The substances which have a definite chemical composition and definite chemical and physical properties are called pure substances.
  • Pure substances are further classified as elements and compounds.
  • Gold and oxygen are examples of elements.
  • Sodium chloride is an example of a compound
  • Air is a mixture of two or more gases present in any proportion. 
  • So it is not a pure substance.
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Which of the following is not an example of a pure substance?