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Q.

Which of the following is an example of a pure substance?

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a

Salt solution

b

Water

c

Air

d

Sugar solution

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.
  • Air, salt solution and sugar solution consist of two or more components mixed in any proportion. So they are not pure substances.
  • Water is made up of hydrogen and oxygen combined in a fixed ratio of 1:8. So it is an example of a compound and thus a pure substance.
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