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IMU CET Kinetics — practice questions — page 3

Explore 71 free Kinetics questions in IMU CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetics questions and exercises with answers

Showing questions 61–71 of 71.

What happens to a catalyst by the end of the reaction it speeds up?Read the answer and worked solution →What defines a homogeneous catalyst?Read the answer and worked solution →What defines a heterogeneous catalyst?Read the answer and worked solution →What effect does a catalyst have on the position of an equilibrium?Read the answer and worked solution →On a reaction diagram the reagents sit at 6 kJ and the transition state at 20 kJ. What is the activation energy?Read the answer and worked solution →Nitric oxide takes part in the decomposition of ozone. Why is it called a catalyst?Read the answer and worked solution →Which prize did Paul Crutzen, Mario Molina and Sherwood Rowland share for their work on ozone?Read the answer and worked solution →Which international treaty began phasing out chemicals linked to ozone destruction?Read the answer and worked solution →Which catalyst coats the surface of most modern three way catalytic converters?Read the answer and worked solution →Why are most catalytic converters preheated by an electric heater?Read the answer and worked solution →Which enzyme deficiency is described as the most common one in humans?Read the answer and worked solution →

Worked practice questions

What happens to a catalyst by the end of the reaction it speeds up?

  1. It is converted into one of the products
  2. It is used up in the very first step
  3. It becomes part of the main intermediate
  4. It is regenerated in the course of it
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Correct answer: D. It is regenerated in the course of it

1. A catalyst lowers the activation energy and so raises the rate. 2. It may well be changed part way through the mechanism. 3. But a later step gives it back unchanged, so it is regenerated. 4. This is why a small amount of catalyst can serve a large amount of reactant. _Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.7 Catalysis_

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What defines a homogeneous catalyst?

  1. It is in the same phase as the reactants
  2. It is in a different phase from reactants
  3. It is always a finely divided solid metal
  4. It is always an enzyme found in the body
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Correct answer: A. It is in the same phase as the reactants

1. Catalysts are sorted by whether they share a phase with the reactants. 2. A homogeneous catalyst sits in the same phase as them. 3. Nitric oxide catalysing the decomposition of ozone is the standard gas phase example. 4. A catalyst in a different phase is called heterogeneous instead. _Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.7 Catalysis_

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What defines a heterogeneous catalyst?

  1. It is in the same phase as the reactants
  2. It is in a different phase, usually a solid
  3. It is always dissolved in the reaction mixture
  4. It is always a gas mixed with the reactants
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Correct answer: B. It is in a different phase, usually a solid

1. A heterogeneous catalyst is in a different phase from the reactants and is usually a solid. 2. It works by offering an active surface for the reaction to happen on. 3. Gas and liquid reactions then occur on that surface rather than out in the bulk. 4. Anything dissolved in the same solution as the reactants would be homogeneous, not heterogeneous. _Source: OpenStax Chemistry (CC BY 4.0), Ch 12 "Kinetics", section 12.7 Catalysis_

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