Adsorption

The given graphs/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

Among physisorption and chemisorption, which type of a adsorption has a higher enthalpy of adsorption?

20% of surface sites are occupied by $N_2$molecules. The density of surface sites is $6.023\times {10}^{14}{\mathrm{cm}}^{-2}$ and total surface area is $1000c{m}^2$. The catalyst is heated to 300 K while $N$ is completely desorbed into a pressure of 0.001 atm and volume of $2.46c{m}^3$. The number of active sites occupied by each $N_2$ molecule will be

20% of surface sites are occupied by ${\mathrm{N}}_2$ molecules. The density of surface sites is $6.023\times {10}^{14}{\mathrm{cm}}^{-2}$ and total surface area is $1000 {\mathrm{cm}}^2$. The catalyst is heated to 300 K while ${\mathrm{N}}_2$ is completely desorbed into a pressure of 0.001 atm and volume of $2.46 {\mathrm{cm}}^3$. The number of active sites occupied by each ${\mathrm{N}}_2$ molecule will be:

Adsorption of gases on solid surface is generally exothermic because:

Rate of physisorption increase with

Rate of physisorption increase with:

Which one of the following is not true with regard to physisorption?

The critical temperature of some gases are: Methane $190 \mathrm{K}$, ammonia $405 \mathrm{K}$, carbon dioxide $304 \mathrm{K}$, $n$-butane $425 \mathrm{K}$ and dihydrogen $33 \mathrm{K}$. The gas that is adsorbed to the maximum extent on $1 \mathrm{g}$ of activated charcoal at a given temperature is

Predict the signs for entropy and enthalpy of adsorption.

What is the effect of surface area on physical adsorption?

There is no effect of surface area on physical adsorption.

There is an effect of surface area on physical adsorption.

How does surface area affects physical adsorption?

The enthalpy of chemical adsorption is _____ than the enthalpy of physical adsorption.

What is the amount of heat released in a chemical adsorption?

The plot that best represents the relationship between the extent of adsorption $(\mathrm{x}/\mathrm{m})$ and pressure $\left(\mathrm{P}\right)$is

The role of pine oil used in froth floatation process is

The colouring matter removed by animal charcoal during purification of sugar acts as an: