Which of the following statements is/are true?

Options

A. Hydrogen diffuses four times faster than oxygen.
B. The temperature of a real gas changes when it expands adiabatically in vacuum.
C. An ideal gas undergoes cooling effect when it suffers an adiabatic expansion in vacuum
D. The Joule-Thomson coeffcient `((dT)/(dP))_(H)` of an ideal gas is zero.

Explanation

Hint: `r prop (1)/(sqrt(M))`
`:. (r_(H_(2)))/(r_(O_(2)))=sqrt((M_(O_(2)))/(M_(H_(2))))=sqrt((16)/(1))=4`
`:. r_(H_(2))=4xxr_(O_(2))`
`((delT)/(delP))_(H)=0` (for ideal gas)
Because `T prop P` (for ideal gas)
`:. (T)/(P)=K` (constant)