Question

According to Maxwell's distribution of molecular speeds, for the below graph drawn for two different samples of gases $A$ and $B$ at temperature $T_{1}$ and $T_{2}$ respectively, which of the following statements is/are INCORRECT :

• A. If $T_{1}=T_{2}$, then molecular mass of gas $B\left(M_{B}\right)$ is greater than molecular mass of gas $A \left( M _{ A }\right)$.
• B. If molecular mass of gas $A \left( M _{ A }\right)$ is equal to molecular mass of gas $B \left( M _{ B }\right),$ then $T _{1}> T _{2}$
• C. If $T_{1}<\,T_{2},$ then molecular mass of gas $B\left(M_{B}\right)$ is necessarily less than molecular mass of gas $A \left( M _{ A }\right)$.
• D. All of these

Answer 1

Answer: (D)

At constant temperature, decrease in molecular mass causes flattening of the graph. For same molecular mass of gas, increase in temperature causes flattening of the graph. $\left( V _{ mp }\right) T _{1}<\left( V _{ mp }\right) T _{2}$