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Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 10 (25 MCQs)

Quiz Instructions

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1. True or False:A reaction can be stopped or slowed down by adding an inhibitor.
2. In a series of reaction, which is the rate determining step
3. Why do most reactions begin with a fast rate and then get slower and slower?
4. What is the degree of the following chemical reaction?4Al + 3O$_{2}$ $\rightarrow$ 2Al$_{2}$O$_{3}$
5. Among the solids the rate ..... with decrease in size
6. The reaction rate constant may be defined as the rate of the reaction when the concentration of each reactants is .....
7. $Abigail is studying for her chemistry exam. She comes across a problem where for a certain reaction, the rate=k[NO]^2[O_2]. She decides to triple the initial concentration of NO. What would be the effect on the initial rate-$
8. The half-life for a zero-order reaction is proportional to:
9. What is the molecularity of the reaction 2HI $\rightarrow$ H$_{2}$ + I$_{2}$
10. Activation energy can be represented in 2D Potential Energy Surfaces
11. Which of the following are true of reaction rates?I. The overall rate law is determined by the fastest step of a reaction II. The presence of a catalyst will increase the number of molecules entering the transition state III. An increase in temperature will increase the rate of a reaction IV. Increasing the concentration of reactants will increase the rate at which products yield
12. A ..... catalyst will increase the rate of the reaction
13. How does temperature affect the rate of a chemical reaction?
14. WHICH OF THE FOLLLOWING IS NOT A FACTOR AFFECTING RATE OF REACTION
15. What is the effect of increasing temperature on the rate constant?
16. The time in which half of the substance has reacted is
17. If the concentration of reactant is doubled in a zero-order reaction, the rate will:
18. Do the reactants in an exothermic reaction have a higher or lower energy than the products?
19. Nuclear reactions follow
20. Describe the role of catalysts in altering the reaction rate.
21. Any factor that increases the number or force of collisions increases the reaction rate.
22. The rate expression for the reaction X (g) + 2Y (g) $\rightarrow$ 3Z (g) israte = k[X]$^{0}$ [Y]$^{2}$ By which factor will the rate of reaction increase when the concentrations of X and Y are both increased by a factor of 3?
23. Reaction between ..... is faster than covalent substances
24. The transition state in a reaction is characterized by:
25. The strengths of intermolecular forces in different substances vary over a wide range but are generally much weaker than intramolecular forces-ionic, metallic or covalent bonds.
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