Particle Size Measurement and Pseudo Order Reaction MCQs

1. Which of the following is the minimum size of particle which can be separated through sieve analysis?

(A) 44 microns

(B) 100 microns

(C) 20 microns

(D) 75 microns

2. The method of particle size measurement is ______

(A) Sedimentation analysis

(B) Microscopic examination

(C) All of these

(D) Sieve analysis

3. Which of the following is the instrument that is used for the examination of particle size = 0.5 micron?

(A) Telescope

(B) Electron microscope

(C) Microscope

(D) All of these

4. Sedimentation analysis is applicable to the liquid dispersions that are containing how much % solids?

(A) 5-10

(B) 4-8

(C) 1-3

(D) 2-5

5. The sedimentation techniques are particularly useful for the particle size ranging from which of the following?

(A) 80-40 µm

(B) 50-10 µm

(C) 100-50 µm

(D) 40-2 µm

6. What measure does the current that is generated in the photoelectric cell represent?

(A) Cohesivity

(B) Adhesivity

(C) Viscosity

(D) Turbidity

7. In the photo-extinction method, a source of light is directed through which of the following suspension?

(A) Kerosene in cement

(B) Cement in kerosene

(C) Cement in water

(D) Water in cement

8. The adsorption method for measurement of the total surface area always involves the evaluation of the quantity of which of the following?

(A) Argon gas

(B) Oxygen gas

(C) Helium gas

(D) Nitrogen gas

9. Due to what do fibrous fillers have a high capacity for absorbing energy?

(A) Composition

(B) Size

(C) Surface area

(D) Shape

10. ______________ is an example of pseudo first order reaction?

(A) Inversion of cane sugar

(B) Oxidation of hydrogen bromide

(C) Gaseous decomposition of hydrogen iodide

(D) Saponification of ester

11. Yet which order kinetics are called pseudo unimolecular reaction reactions which are bimolecular?

(A) Second

(B) First

(C) Zero

(D) Third

12. Which of the following are based on the collision model, the atoms at the top of the potential energy hill?

(A) Steric factor

(B) Energetic atom

(C) Transition state

(D) Activation energy

13. _______ concentration plot is linear for a first-order reaction. A is one of the reactants

(A) [A]² versus time

(B) Ln[A] versus time

(C) [A] versus time

(D) v[A] versus time

14. Termolecular refers to which one?

(A) 4 molecules colliding

(B) 5 molecules colliding

(C) 3 molecules colliding

(D) 2 molecules colliding

15. Threshold energy is the sum of which one?

(A) External energy and activation energy of reactants

(B) Thermal energy and activation energy

(C) External energy and internal energy of reactants

(D) Internal energy and activation energy of reactants

16. For the rate = k[NO]²[O₂] in a certain reaction, when the initial concentration of NO is tripled, what happens to the initial rate?

(A) Increases by a factor of six

(B) Increases by a factor of three

(C) Decreases by a factor of nine

(D) Increases by a factor of nine

17. Which of the following is the rate-determining step in a series of reactions?

(A) Slowest

(B) Simplest

(C) Fastest

(D) Fast and complex