(2) B
For an ideal gas
PV = nRT
where n = number of moles. For mass m of gas having molar mass
M ; n = m/M. Therefore
![](https://www.sarthaks.com/?qa=blob&qa_blobid=9870886838051965003)
Obviously at constant volume P–T graph is a straight line having a slope = mR/MV. When m is doubled and volume is halved the slope of P vs T becomes 4 times its earlier value i.e. increases.