The value of n in molecular formula ${\mathrm{Be}}_{\mathrm{n}}{\mathrm{Al}}_2{\mathrm{Si}}_6{\mathrm{O}}_{18}$ (molecular mass-$537$) is

Given: Atomic mass of $\mathrm{Be}=9, \mathrm{Al}=27, \mathrm{Si}=28$ and $\mathrm{O}=16$.

By combining Boyle's law, Charles' law, and Avogadro's law an equation can be derived that gives the simultaneous effect of the change of pressure and temperature on the volume of the gas. This is known as ideal gas equation. The number of moles of ${\mathrm{H}}_2$ in $0.224 \mathrm{L}$ of hydrogen gas at $\mathrm{STP} (273 \mathrm{K}, 1 \mathrm{atm})$ assuming ideal gas behaviour is

By combining Boyle's law, Charles' law, and Avogadro's law an equation can be derived that gives the simultaneous effect of the change of pressure and temperature on the volume of the gas. This is known as ideal gas equation. Plot of $\mathrm{P} \mathrm{vs} \frac{1}{\mathrm{V}}$ of a gas at different temperature is given as

The correct order of temperature ${\mathrm{T}}_1, {\mathrm{T}}_2$ and ${\mathrm{T}}_3$ is