Question

There is $10$ litre of gas at $STP$. Which of the following changes keeps the volume constant:

• A. 273K and 2atm
• B. 273${}^{\circ }C$ and 2atm
• C. 546${}^{\circ }C$ and 0.5atm
• D. 0${}^{\circ }C$ and 0atm

Answer 1

Answer: (B)

273${}^{\circ }C$ and 2atm

There is $10$ litre of gas at $STP$. The changes ${273}^{\circ }C$ and $2atm$ keeps the volume constant.

$PV=nRT$

Hence, $V\propto \frac{T}{P}$ (at constant n).

Thus, when both temperature and pressure are doubled, the volume remains constant.

Hence, the correct option is $\text{B}$