• # question_answer In a closed flask of 5 litres, 1.0 g of ${{H}_{2}}$ is heated from 300 to 600 K. which statement is not correct [CBSE PMT 1991] A)                 Pressure of the gas increases     B)                 The rate of collision increases     C)                 The number of moles of gas increases D)                 The energy of gaseous molecules increases

At constant V of a definite mass                    $\frac{{{P}_{1}}}{{{T}_{1}}}=\frac{{{P}_{2}}}{{{T}_{2}}}\therefore \frac{{{P}_{1}}}{{{P}_{2}}}=\frac{300}{600}=\frac{1}{2}$ i.e. pressure increases                                 and on increasing temperature energy of molecules increases so the rate of collisions also increases and number of moles remains constant because there is neither addition nor removal of gas in the occurring.