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Punjab (PTB) · Chapter test · Free

1st Year Chemistry Chapter 7 TestReaction Kinetics

30 marks · 40 minutes · 21 questions. Covers: CHAP 7: Reaction Kinetics.

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1st Year Chemistry Chapter 7 Test

1st Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. The order of reaction is:

    1. The total number of molecules taking part in the rate determining step

    2. The total number of molecules taking part in a chemical reaction

    3. Both a and b

    4. None of these

  2. At the beginning the decrease in the concentration of reactants is:

    1. Slow

    2. Moderate

    3. Rapid

    4. None of these

  3. The measurement of rate of reaction involving change in ionic concentration is followed by:

    1. Spectrometric method

    2. Chemical method

    3. Refractrometric method

    4. Conductivity method

  4. The reaction, has order:

    1. First order

    2. Second order

    3. Third order

    4. Fractional order

  5. When one of the product starts acting as a catalyst then it is called:

    1. Homogenous catalysis

    2. Heterogeneous catalysis

    3. Autocatalysis

    4. Enzyme catalysis

  6. On a Boltzmann distribution curve, the area under the curve represents:

    1. Activation energy of the reaction.

    2. Total number of molecules in the sample.

    3. Average kinetic energy of the molecules.

    4. Rate constant of the reaction.

  7. The number of molecules having energy more than Ea becomes double when the temperature is raised by.

    1. 273oC

    2. 516 oC

    3. 10oC

    4. 100oC

  8. If the rate equation of a reaction Product, Rate = k[A]2 [B] the reaction is ..........order.

    1. 1st

    2. 2nd

    3. 3rd

    4. Zero

  9. On a Boltzmann distribution curve, the activation energy (Ea) is represented by:

    1. The height of the peak

    2. The area under the entire curve

    3. A vertical line drawn at a specific kinetic energy value

    4. The difference between the peak and the X-axis

  10. Changes in concentration of reactants and products can be followed by different methods; the method using volume change is called:

    1. Spectrometric method

    2. Conductivity method

    3. Dilatometric Method

    4. All of these

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. What is meant by order of reaction?

  2. A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration is doubled and reduced to half?

  3. Rate of reaction changes with time. Why?

  4. How ions in a chémical reaction helps to measure the rate of reaction?

  5. Differentiate between rate and rate constant of a reaction.

  6. What do you understand by the rate of a reaction?

  7. How Nature of Reactants effect the rate of reaction?

  8. Describe how surface area affects rate of reaction?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. Three experiments that have identical conditions were performed to measure the initial rate of the reaction.

    Experiment [HI] (M) Rate (M/s)
    1 0.015 1.1x10-3
    2 0.030 4.4x10-3
    3 0.045 4.4x10-3

    Write the rate law for the reaction. Find the value and units of the specific rate constant, k.

  2. A first order reaction is found to have a rate constant, k = 5.5 × 10-14 s-1. Find the half-life of the reaction. 

    Temp. (K) Rate constant (cm3 mol–1S–1) (K)
    500 6.814 x 10–4
    550 2.64 x 10–2
    600 0.56 x 100
    650 7.31 x 100
    700 66.67 x 100

  3. Calculate the reaction rate if the concentration of A is 0.5 M, the concentration of B is 0.2 and the rate constant k is 4.0M-2s-1. Given the rate law for a reaction: Rate = k[A][B]2.