Mixing of two different ideal gases under isothermal reversible conditions will lead to:

Assertion : Wet air is heavier than dry air.
Reason : The density of dry air is more than density of water.

Why is it necessary for chemists to understand the laws that govern the physical states of matter?

Which of the following has higher surface tension: pure water or soapy water?

$A$ gas $A$ diffuses at a rate which is twice that of another gas $B$. The ratio of molecular weights of $A$ to $B$ is

$1 \text{ mole}$ of gas $A$ and $1 \text{ mole}$ of gas $B$ at $27^{\circ} C$ were pumped into a $24.6 \ L$ volume pre-evacuated isolated flask. The catalyst coated inside the flask catalyses the following reaction $A_{(g)} + B_{(g)} \longrightarrow 2 D_{(g)}$. The kinetic energy of $D$ is $98.03 \ L \ atm$. Calculate the pressure realized at the end of the reaction. (in $atm$)