$50 \ mL$ of each gas $A$ and gas $B$ takes $150$ and $200$ seconds respectively for effusing through a pinhole under similar conditions. If the molecular mass of gas $B$ is $36$,the molecular mass of gas $A$ will be:

Mountaineers carry oxygen cylinders with them because ...

When a gas is heated at constant pressure from $20\,^oC$ to $40\,^oC$,its volume:

$A$ gas diffuses $1/5$ times as fast as hydrogen. Its molecular weight is

Sulphur dioxide $(SO_2)$ and oxygen $(O_2)$ were allowed to diffuse through a porous partition. $20 \ dm^3$ of $SO_2$ diffuses through the porous partition in $60 \ seconds$. The volume of $O_2$ in $dm^3$ which diffuses under the similar conditions in $30 \ seconds$ will be (atomic mass of sulphur $= 32 \ u$)

Given below are two statements.
Statement $I$: Viscosity of liquid decreases with increase in temperature.
Statement $II$: The units of viscosity are $kg \ m^{-1} \ s^{-2}$.
The correct answer is