MCQs on chapter 5(Surface Chemistry) PART 1

These are MCQs on chapter 5(Surface Chemistry) PART 1 for 12^th Class. Practice MCQs to check your knowledge for Entrance examination like CBSE BOARD, CBSE NEET etc

1. On which factors interface depends ?

• Size of the molecules in the bulk phase
• Wieght of the molecules in the bulk phase
• Numbers of molucules in the bulk phase
• Physical state of molucules in the bulk phase

2. Which of the following phenomenon in not involved in surface chemistry ?

• Elecrode reactions
• Dissolution
• Heterogeneous catalysis
• Liquid and its vapour taken in closed vessel

3. How much pascal high vacuum is required to achive completely pure surface of metal?

• 10^-8 to 10^-9
• 10^-8 to 10^-10
• 10^-6 to 10^-9
• 10^-8 to 10^-7

4. Due to adsorption

• surface energy increases
• surface energy becomes zero
• surface energy decreases
• no change occurs in surface energy

5. Which of the following processes is adsortion phenomenon ?

• Soakd of rayon clothes in coloured solution
• Contact between silicagel and vapour of water
• Contact between anhydrous CaCl₂ and vapour of water
• H₂S gas in contact to water

6. Which of the following is good adsorbent ?

• Silica gel
• Alumina
• Clay
• All the given

7. Which type of process adsorption is ?

• Isotonic
• Isochonic
• Indothermic
• Exothermic

8. When adsorption phenomenon occurs complete ?

• ΔH < O,ΔG < O,ΔS < O
• ΔG < O,ΔH < O,ΔS > O
• ΔH > O,ΔS > O,ΔG < O
• ΔG < O,ΔS < O,ΔH > O

9. Which is correct for adsorption ?

• Δ H-T Δ S is negative
• ΔH is positive
• Δ H-T Δ S is positive
• TΔS and ΔG=0

10. Which of the following statement is not true ?

• The value of adsorption enthalpy of physical adsorption is less than chemical adsorption
• Physical adsorption occurs due to van der waals’ forces
• Chemical adsorption decreases at high temperacture and low pressure
• Physical adsorption is reversible