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Is Matter Around Us Pure — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure1 Mark
MCQ
Which of the following is true?
  • A
    Compounds have fixed composition.
  • B
    The properties of compounds are similar to its components.
  • C
    Compound can be prepared by physical method.
  • D
    No heat is evolved or absorbed in the formation of compound.
✓

Answer

  1. Compounds have fixed composition.

Explanation:

A chemical compound is a new substance that forms when atoms of two or more elements react with one another. A compound that results from a chemical reaction always has a unique and fixed chemical composition. The substances in the compound can be separated from one another only by another chemical reaction.

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