Comparison of Physisorption and Chemisorption

Q. An ideal gas obeying kinetic theory of gases can be liquefied if

1. Its pressure is more than P_c at a temperature less than T_c
2. It cannot be liquefied at any value of P and T
3. Its pressure is more than critical pressure P_c
4. Its temperature is more than critical temperature T_c

Q.

When colloids are subjected to an electrical field particles move towards an electrode and precipitate. Name the process.

1. Electrophoresis

2. Peptization

3. Tyndal effect

4. Brownian movement

Q. Although nitrogen does not adsorb on iron surface at room temperature, it adsorbs on the same surface at 83 K. Which one of the following statement is correct?

1. At 83 K, there is formation of monomolecular layer
2. At 83 K, there is formation of multimoleular layer
3. At 83 K, nitrogen molecules are held by chemical bonds
4. At 83 K, nitrogen is adsorbed as atoms

Q.

Adsorption is exothermic in nature. Give reason

Q. Which among physisorption and chemisorption has a higher enthalpy of adsorption?

Q. The correct option(s) related to adsorption processes is(are)

1. Chemisorption results in a unimolecular layer.
2. Chemisorption is an endothermic process.
3. Lowering the temperature favors physisorption processes.
4. The enthalpy change during physisorption is in the range of $100$ to $140\text{kJ}{\text{mol}}^{-1}$.

Q. 34. For [Ag (NH3)2]+ at 298K at 10 dissociation constant in Ag+&NH3 If E^° Ag+/Ag=0.8V so what is E^° value of half cell [Ag(NH3)2]+ +e.>Ag+ +2NH3 1)0.33V 2)0.33V 3)0.033V 4)0.033V

Q.

Why is chemisorption called activated adsorption?

Q.

During electrosmosis of Fe(OH)3 Sol

A.)Sol particles move towards anode

B.)Sol particles move towards cathode

C.)Dispersion medium moves towards anode

D.) Dispersion phase move towards cathode

Q. Distinguish between chemical and physical adsorption.

Q. the rms speed of Nitrogen molecule in a gas is u. if the temp. is doubled and the nitrogen molecule dissociate into nitrogen atoms the rms speed becomes

Q. C6H5CHO + C6H5COCH3 +CH3COCH3 +(OH) what will be the major product?

Q. Select the correct statements.
(i) Physical adsorption is weak, multilayer, non-directional and non-specific.
(ii) Chemical adsorption is strong, unilayer, directional and strong.
(iii) Adsorption decreases with temperature.
(iv) Chemical adsorption is more stronger than physical adsorption.

1. (i), (ii) and (iv) only
2. (i) and (iii) only
3. (iii) only
4. All of these

Q. 31. Find the emf of the cell Zn(s)|Zn+2 (0.01M)|KCl saturated|Zn+2 (1.0M)|Zn (s).

Q. The correct statement(s) pertaining to the adsorption of a gas on a solid surface is(are):
(i) adsorption is always exothermic.

1. (i) and (iv) only
2. (ii) and (iii) only
3. (i), (ii) and (iv) only
4. All of these.

Q. The given graphs I, II, III and IV represent the 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?

1. I is physisorption and III is chemisorption.
2. I is physisorption and II is chemisorption.
3. IV is chemisorption and III is physisorption.
4. IV is chemisorption and III is chemisorption.

Q. 99% ofa first order reaction was completed in 32minutes when 99.9% of the reaction willconpete

Q. 19. In an electric field, the particles of the colloidal system move towards the cathode. The vaogukatipn of the same sol is studied using K2SO4, Na3PO4, K4[Fe(CN)6] and NaCl . their coagulating power should be

Q. Adsorption increases with increase in temperature in Physisorption.

1. True
2. False

Q. A particular adsorption process has the following characteristics: (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

1. Adsorption is monolayer
2. Energy of activation in low
3. Adsorption increases with increase in temperature
4. Enthalpy of adsorption is greater than $100{\text{kJ mol}}^{-1}$

Q. Calculate the fraction of nitrogen molecule at 101.325k pascal and 300k whose speed is in range of ∪ mps +0.0005∪ mps to ∪ mps-0.005∪ mps?

Q. stability of lyophilic sols are due to whether charge or layer of dispersion medium?

Q. A particular adsorption process has the following characteristics : (i) It arises due to van der Waals forces and (ii) it is reversible. Identify the correct statement that describes the above adsorption process :

1. Adsorption is monolayer
2. Enthalpy of adsorption is greater than 100 kJ mol${}^{-1}$
3. Energy of activation is low
4. Adsorption increases with increase in temperature

Q. why adsorption is exothermic process?

Q.

Which property of colloids is applied in rubber plating & sewage disposal?

1. Peptization

2. Tyndal effect

3. Brownian movement

4. Electrophoresis

Q. What are different types of adsorption? Give any three differences between characteristics of these different types of adsorption.

Q. Which one of the following is a case of negative adsorption?

1. Acetic acid solution in contact with animal charcoal
2. Dilute $KCl$ solution in contact with blood charcoal
3. Concentration $KCl$ solution in contact with blood charcoal
4. $H_2$ gas in contact with charcoal at $300K$

Q. Write the differences between physisorption and chemisorption with respect to the following:
(i) specificity
(ii) temperature dependence
(iii) reversibility
(iv) enthalpy change

Q. Assertion :A gas with higher critical temperature gets adsorbed to more extent than a gas with lower critical temperature. Reason: The easily liquifiable gases get adsorbed to more extent.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Physical adsorption of a gaseous species may change to chemical adsorption with:

1. increase in temperature
2. decrease in temperature
3. increase in surface area of adsorbent
4. decrease in surface area of adsorbent