Which of the following is not a property of pure substances?

Homogenous

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Definite composition

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They have fixed melting and boiling points

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They can be broken down into simpler substances by physical means

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Solution

The correct option is D They can be broken down into simpler substances by physical means
A pure substance has the same type of particles with fixed melting and boiling point. It has a definite composition and is, therefore, homogeneous in nature.

A compound is a pure substance that can be broken down into simpler substances by chemical means whereas elements can not be broken down into simpler substances by either physical or chemical means.
Therefore, option D is correct.

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Similar questions

There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.

(a) What type of substance could X be? Name one substance like X.

(b) What type of substance could Y be? Name one substance like Y.

(d) Which process involves absorption or release of an appreciable amount of energy: formation of substances X or formation of substance Z?

(e) Name the three groups into which all the substances like Y are divided on the basis of their properties.

Q. An .......... is a substance that cannot be broken down into simpler substances by chemical means.

Q. A substance which cannot be broken down into simpler substances by chemical reaction is called an ______ .

Q. Which of the following statement(s) is/are false?
1. A pure substance is heterogeneous in nature.
2. The composition of a pure substance can be altered by any physical means.
3. A pure substance contains a fixed number of particles.

Few properties are mentioned below. Specify the property as mixture or compound:

STATEMENT 1: The constituents can be separated easily by physical means.

STATEMENT 2: Has a variable composition.

STATEMENT 3: Has a fixed melting and boiling point.

STATEMENT 4: Shows entirely different properties from constituent elements.

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