Which of the following statements is correct?
A) A pure substance is not a compound.
B) A pure substance is a combination of two elements in variable proportions.
C) A mixture is a combination of two or more pure substances in definite proportions.
D) A mixture cannot be composed of two or more compounds.
E) A pure substance is either an element or a compound.

Question

Quizplus · Accepted Answer

A pure substance can be either an element or a compound. A compound is a pure substance that is formed when two or more elements chemically combine in fixed proportions. An element is a substance that cannot be broken down into simpler substances by chemical means. Therefore, statement A is incorrect as a compound is a type of pure substance. Statement B is also incorrect as it suggests a pure substance can be a combination of two elements in variable proportions, which is not true. Statement C is incorrect as a mixture is a combination of two or more substances in variable proportions, not in definite proportions. Statement D is incorrect as a mixture can be composed of two or more compounds.

Which of the Following Statements Is Correct