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10 January, 05:08

17, A compound is a substance composed of two or

more elements that are

(1) chemically combined in a fixed proportion

(2) chemically combined in a variable proportion

(3) physically mixed in a variable proportion

((4) physically mixed in a fixed proportion

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Answers (1)
  1. 10 January, 05:20
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    A

    Explanation:

    Compounds are chemically combined in a fixed proportion. Like Hydrogen and Oxygen together form H2O, it is in fixed proportion 2 Hydrogen for one Oxygen. Also, they are chemically combined thus water has different properties than the individual elements that make it.
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