Test Preparation on Gaseous State-II-Chemistry Test Series IIT JEE-2020

Equal moles of hydrogen and oxygen gases are placed in a
container with a pin-hole through which both can escape. What
fraction of the oxygen escapes in the time required for one-half
of the hydrogen to escape

The ratio between the root mean square speed of H2 at 50 K
and that of O2 at 800 K is

X ml of H2 gas effuses through a hole in a container in 5
seconds. The time taken for the effusion of the same volume of
the gas specified below under identical condition is