Ncert Exercises & Solutions

The incorrect statement among the following is:

1.	A molecule of a compound has atoms of different elements.
2.	A compound cannot be separated into its constituent elements by the physical method of separation.
3.	A compound retains the physical properties of its constituent elements.
4.	The ratio of atoms of different elements in a compound is fixed.

Hint: Compound contains two or more than two elements combined together in a fixed proportion by mass.

A compound is a pure substance containing two or more than two elements combined together in a fixed proportion by mass

and which can be decomposed into its constituent elements by suitable chemical methods.

Further, the properties of a compound are quite different from the properties of constituent elements.

e.g., water is a compound containing hydrogen and oxygen combined together in a fixed proportion. But the properties

of water are completely different from its constituents, hydrogen and oxygen.