Q4. Write true or false against each of the following statement
a)
In gases, the molecules are very tightly packed.
b) Liquids have a fixed shape.
c)
A liquid changes into vapour on heating
d)
The states of matter are always constant.
e)
The liquid in which solid dissolves is called a solute.
f)
One state of matter cannot be changed into another.
g)
All materials dissolve in water and form solution.

Under normal conditions, there are three distinct states of matter: solids, liquids, and gases. Solids have a definite shape and volume, liquids have a definite volume but their shape changes depending on the container in which they are held, and gases have neither a definite shape nor a specific volume as their molecules move to fill the container in which they are held.

When heating a liquid, it changes into vapor, which is a gaseous state. On the other hand, in gases, molecules are not tightly packed but move freely. Hence, statement a, b, c, and g in the question are true, while statements d, e, and f are false.

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