1st Year Chemistry Chapter 09 Reaction Kinetics MCQs Quiz Test

If you are looking MCQs for 1st year Chapter Nine "Reaction Kinetics" MCQs Question Answers with solutions you are here on right website. On this Page you will learn Chapter Nine objective type solved Questions with solutions. All of these chapter wise first Year Chemistry question answers are helpful for upcoming exams and tests preparations. These MCQs are also helpful for entry tests.

First Year Chemistry MCQs Unit 9 Reaction Kinetics Quiz Test

You will learn in this Chapter:

• Rate of Reactions
• Orders of reaction
• Half-Life period
• Determination of Rate of Chemical Reaction
• Physical and Chemical methods
• Energy of Activation
• Finding order of reaction
• Factors affecting the rate of reactions
• Catalysis

Q.1: The activation energy of reaction?

1. Includes the average kinetic energy of the reactants
2. Is in addition to the average kinetic energy of the reactants
3. Is in addition to the average kinetic energy of the products
4. Required for effective collisions

D

Q.2: E_a appears as a potential energy hill between --------- for carrying out the reaction?

1. Among the reactants
2. Reactants and the products
3. Among the products
4. None of the above

B

Q.3: The slope of the curve between 1/T and log k gives?

1. Reaction rate
2. Both of the above
3. Specific rate constant
4. Activation energy

D

Q.4: The unit of the rate constant is the same as that of the rate of reaction in?

1. 1^st order reaction
2. Zero-order reaction
3. 2^nd order reaction
4. 3^rd order reaction

B

Q.5: Arrhenius equation can be used for evaluating?

1. Specific rate constant
2. Both of the above
3. Activation energy
4. Half-life period

C

Q.6: A catalyst can?

1. Accelerate the reaction rate
2. Retard the reaction rate
3. Chemically un-consumed at the end of the reaction
4. All of the above

D

Q.7: The 2^nd order reaction becomes 1^st when?

1. One of the reactants is limiting
2. One of the reactants is in large excess
3. None of the reactants is in large excess
4. One of the reactants is acidic

B

Q.8: Oxidation of SO_2(g) in the presence of NO_(g) catalyst is an example of?

1. Homogeneous catalysis
2. Autocatalysis
3. Heterogeneous catalysis
4. Negative catalysis

A

Q.9: Oxidation of SO_2(g) in the presence of V₂O_5(s) is an example of?

1. Homogeneous catalysis
2. Autocatalysis
3. Heterogeneous catalysis
4. Negative catalysis

C

Q.10: Which one of the following is not a characteristic of a catalyst?

1. It is specific in its action
2. Provides the reactants a low activation energy barrier
3. Becomes chemically changed at the end of a reaction
4. It can be poisoned by an impurity which deactivates its catalytic capability

C

Q.11: The specific rate constant of a chemical reaction is the rate of the reaction when the concentration of the reactant is?

1. Less than unity
2. Greater than unity
3. Equal to unity
4. Equal to the concentration of 2^nd order reaction

C

Q.12: The half life for a 1^st order decomposition of a substance dissolved in CCl₄ is 2.5 hours at 30°C. The amount of substance left after 10 hours if the initial weight of the substance is 160g?

1. 5g
2. 15g
3. 10
4. 20g

C

Q.13: An endothermic reaction A → B has an activation energy 15kcal /mol and the heat of reaction 5kcal/mol. The activation energy for the reaction B → A will be?

1. 20kcal/mol
2. 10kcal/mol
3. 15kcal/mol
4. None of the above

B

Q.14: The rate of reaction is doubled for every 10°C rise in temperature. The increase in reaction rate as a result of temperature rise from 10°C to 100°C is?

1. 112
2. 400
3. 512
4. 614

C

Q.15: For the 1^st order decomposition reaction 2N₂O₅ (g) → 4NO_2(g) + O_2(g) the half-life is given as?

1. 0.693/k
2. log2/k
3. 0.693/2k
4. ln2/k

A

Q.16: Which one of the following is correct about the following reaction if the iron is not 100% pure?
2Fe + 3H₂O + O₂ → Fe₂O₃.3H₂O?

1. Very fast reaction
2. Moderately reaction
3. Very slow reaction
4. Not predicted

C

Q.17: For a chemical reaction to occur?

1. The vessel shall be open
2. Reacting molecules should have less energy than Ea at the time of the collision
3. Reacting molecules must be properly oriented and energy more than or equal to Ea
4. The reacting molecules must not collide with each other

C

Q.18: The reaction that involves gases, its rate does not depend upon?

1. Catalyst
2. Partial pressure
3. Temperature
4. Moles dm^-3

D

Q.19: The mathematical relation between the rate of reaction and the concentrations of the reactants is known as the?

1. Rate equation
2. Arrhenius equation
3. Rate low
4. Both a and c

C

Q.20: Which one affects the specific rate constant?

1. Temperature
2. Concentration of reactants
3. Catalyst
4. All of these

A

Q.21: Which one is a chemical method for the determination of the rate of reaction?

1. Spectrometry
2. Refractrometric method
3. Dilatometric method
4. Titration

D

Q.22: When the concentration of a reactant in the reaction is increased by 8 times, the rate increased only by 2 times. The order of the reaction is?

1. 1
2. ½
3. 1/3
4. 2

C

Q.23: The rate expression for a reaction A+B → products is rate = k [A]^2/3 [B]^-1/2 the order of reaction is?

1. 0
2. 5/2
3. 3/2
4. 1

D

Q.24: If 75% of any given amount of radioactive element disintegrates in 60 min. The half life of a radioactive element is.?

1. 20 min
2. 30 min
3. 45 min
4. 25 min

B

Q.25: The unit of rate constant depends on?

1. Number of reactants
2. Order of reaction
3. Concentration terms
4. Molecularity of reaction

B

Q.26: The unit of the rate constant of a second-order reaction is?

1. mol dm^-3 sec^-1
2. mol^-2 dm⁺⁶
3. sec^-1
4. mol^-1 dm⁺³ sec^-1

D

Q.27: The half-life period of the zero-order reaction is equal to?

1. 0.693/K
2. 1/Ka
3. a/2
4. 1.5/Ka²

C

Q.28: The influence of temperature on the reaction rate is predicted by?

1. Free energy change of reaction
2. Arrhenius equation
3. Van der Waal’ equation
4. Kinetic equation

B

Q.29: If the energy of the activated complex lies close to the energy of reactants, it means that reaction is?

1. Slow
2. Endothermic
3. Exothermic
4. Exothermic and fast

D

Q.30: Which of the following statements regarding a catalyst is not true?

1. A catalyst does not alter the equilibrium in a reversible reaction
2. A catalyst can initiate the reaction which is not thermodynamically favorable
3. Catalytic reactions are very specific
4. A catalyst remains unchanged in composition and quantity

B