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India Post Postman Pure Substances and Mixtures — practice questions

Explore 1 free Pure Substances and Mixtures questions in India Post Postman Science. Open each question or exercise to read its content, reference answers and available explanation.

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Pure Substances and Mixtures questions and exercises with answers

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Which of the following is a pure substance?Read the answer and worked solution →

Worked practice questions

Which of the following is a pure substance?

  1. Air
  2. Methane
  3. Sugar solution
  4. Milk
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Correct answer: B. Methane

1. A pure substance has a fixed composition made of one kind of particle. 2. Air, sugar solution and milk are all mixtures of more than one substance. 3. Methane (CH₄) is a single compound, so it is a pure substance. _Source: RRB Group D CEN-02/2018 PYQ, Q.21._

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