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Chemical Kinetics Test - 12

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Chemical Kinetics Test - 12
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Weekly Quiz Competition
  • Question 1
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    Which of the following statement is true for order of a reaction?

    Solution

    Order of a reaction is experimentally determined quantity so it can be negative fractional or zero.

  • Question 2
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    For the first order reaction, half life is equal to

    Solution

    For 1st order reaction half life is independent of initial concentration of reactant.

  • Question 3
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    Straight line graph for first order reaction is obtained between

    Solution

  • Question 4
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    The effect of temperature on reaction rate is given by

    Solution

    k = A exp(-kt)

  • Question 5
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    The chemical reaction in which reactants require high amount of activation energy are generally

    Solution

    If activation energy is high rate of reaction will decrease and reaction will be slow.

  • Question 6
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    The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called

  • Question 7
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    The expression which relates the rate of reaction to the concentration of the reactants are called?

    Solution

    Rate law states that rate of reaction is dependent on concentration of reactant raise to power order of reaction.

  • Question 8
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    The constant k used in rate equation is known as

    Solution

    Rate constant is also known as velocity constant.

  • Question 9
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    The radioactive isotope used in determining the age of organic substances is

    Solution

    Carbon – 14 is used in determining the age of organic substances

  • Question 10
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    The substance that slows down the reaction without being consumed is known as

    Solution

    Inhibitors inhibits the action of catalyst and hence slows down the rate of reaction.

  • Question 11
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    Which among the following statement is not true for catalyst?

    Solution

    Catalyst doesnot change the equilibrium constant it only helps in reaching the equilibrium at a faster rate.

  • Question 12
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    A first order reaction is 50% completed in 1.26 × 1014 s. How much time would it take for 100% completion?

    Solution

    The time taken for half the reaction to complete, i.e., the time in which the concentration of a reactant is reduced to half of its original value is called half-life period of the reaction. But it is impossible to perform 100% of the reaction. Whole of the substance never reacts because in every half-life, 50% of the substance reacts. Hence, time taken for 100% completion of a reaction is infinite. 

  • Question 13
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    Collision theory is applicable to

    Solution

    Collision theory is only applicable to bimolecular reaction.

  • Question 14
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    Rate of reaction does not remain constant throughout because

    Solution

    Rate of reaction is dependent on concentration of reactant

  • Question 15
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    The unit of rate constant for a first order reaction is

    Solution

    The correct answer is Option C.

    Let R be the rate of reaction.
    For first order reaction,
    R=K[A]1
    ⇒K=R[A]-1
    Whereas, K and [A] are rate constant and initial concentration of reactant respectively.
    Therefore,
    Unit of rate constant =(mol L-1)1-nsec-1
    For first order reaction, n=1
    Unit of rate constant = sec-1
    Hence the unit of rate constant for first order reaction is sec-1.

  • Question 16
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    Reaction which takes place in one step is known as

    Solution

    Elementary reaction are one step reactions.

  • Question 17
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    Which among the following statement is not true for rate constant of a reaction?

    Solution

    Rate constant is independent of concentration of reactant.

  • Question 18
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    Which among the following is an example of pseudo first order reaction?

    Solution

    In acid catalysed hydrolysis of ethylacetate the water is in excess so it is pseudo 1st order reaction.

  • Question 19
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    Which among the following is an example of first order reaction?

    Solution

    Decomposition of N2O5 is 1st order reaction.

  • Question 20
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    The rate law for the reaction   is given by rate = k[RCl]. The rate for this reaction

    Solution

    Since order of reaction with respect to RCl is one so if conc of RCl is halfed the rate of reaction will also become half.

  • Question 21
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    For an endothermic reaction, the minimum value for the energy of activation in terms of will be

    Solution

  • Question 22
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    Order of the photochemical reaction occurring between hydrogen and chlorine is

    Solution

    Photochemical reaction between H2 and Cl2 is 0 zero wrt to reactants.

  • Question 23
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    The temperature coefficient of most of the reactions lies between

    Solution

    For every 100 rise in temperature rate of reaction increases by factor of 2 or 3.

  • Question 24
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    Following mechanism has been proposed for a reaction

    The rate law expression for the reaction is

    Solution

    Rate of reaction is determined by slowest step.

  • Question 25
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    The expression which gives 3/4th life of first order reaction is

    Solution

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