Which of the following statements is true for adsorption?

Which of the following orders is correct?

The adsorption of hydrogen by metals is called

Which of the following represents the Freundlich adsorption isotherm equation for the adsorption of a gas on a solid (where $n > 1$)?

Assertion $(A)$: van der Waals' forces are responsible for chemisorption.
Reason $(R)$: High temperature is favourable for chemisorption.
The correct answer is

The graph of $\log \frac{x}{m}$ vs $\log p$ for an adsorption process is a straight line inclined at an angle of $45^{\circ}$ with an intercept equal to $0.6020$. The mass of gas adsorbed per unit mass of adsorbent at the pressure of $0.4 \ atm$ is $......... \times 10^{-1}$ (Nearest integer). Given: $\log 2 = 0.3010$.