Question

A gas occupies $20$ litre of volume under $STP$. What will be its volume if the pressure is increased four time keeping the temperature constant ?

• A. $20L$
• B. $80L$
• C. $5L$
• D. $4L$

Answer 1

The correct option is C $5L$

Here answer is option C

Let pressure ($P_1$)=x

pressure ($P_2$)=4x

volume ($V_1$)=20L

volume ($V_2$)=?

By applying Boyle's law

$P_1\times V_1=P_2\times V_{2}x\times 20=4x\times V_2{V}_2=\frac{20x}{4x}{V}_2=5litre$