Questions & Answers

Mixture is a physical combination of two or more pure substances.
A: True
B: False

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Hint: Whenever there is some kind of change in state, appearance, temperature, or precipitates are formed of a substance then we can say that there is some chemical change in the substance otherwise it will be a physical change.

Complete step by step answer:
Whenever we mix two substances in indefinite proportions, the mixture is formed. In mixture individual identities of substances are retained. There is no change in the properties of the substances. We know whenever there is some change in appearance, state, or temperature of a substance then chemical change occurs otherwise it is a physical change and in mixture properties of substances that are mixed does not change. So, we can say that no chemical change occurs in mixture or mixture is a physical combination of two or more substances (as there is no chemical change). A mixture may be defined as the physical combination of two or more substances in which the identities of substances are retained. In this question, the given statement is: the mixture is a physical combination of two or more pure substances (pure substances are defined as the substances that are made up of only one type of atom or molecule). This is correct. Therefore the answer is true.

Note:
A chemical substance is a form of matter having the constant chemical composition and characteristic properties. These substances can’t be separated by physical methods (methods in which breaking of bonds doesn’t happen are called physical methods).