Question

Assertion (A): At constant temperature, $PV$ vs $P$ plot for some real gases is initially curvy.
Reason (R): At high pressure all gases have $(Z>1)$ but at intermediate pressure most gases have $(Z<1)$.

• A. Both A and R are true and R is the correct explanation of A
• B. Both A and R are true but R is not the correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is B Both A and R are true but R is not the correct explanation of A

$PV$ versus $P$ plot is straight line for ideal gases but not for real gases. It is initially curvy as inter-molecular forces of attraction are present in real gases such as carbondioxide .
At high pressure, there is positive deviation from ideal behaviour $(Z>1)$ but at intermediate or moderate pressure, the real gases shows negative deviation from ideal behavior $(Z<1)$.