Ncert Exercises & Solutions

Which of the following diagrams (figure) depicts ideal gas behaviour?

1.	(a), (c)	2.	(a), (d)
3.	(c), (d)	4.	(a), (b)

(1) Hint: Use the ideal gas equation.

We know that the ideal gas equation is PV =nRT

Step 1: Find the correct condition in each option.

(a) When P=constant, volume V

\propto

Temperature T

(b) When T = constant, pV = constant
So, the graph is a rectangular hyperbola.

\propto

T
So, the graph is a straight line passes through the origin.

(d) pV

\propto

\Rightarrow

\frac{p V}{T}

= constant

\Rightarrow

So, the graph, hence, passes through the origin.

So, (d) is not correct.