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Chemistry Test 25
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Chemistry Test 25
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  • Question 1/4
    4 / -1

    Reaction rates are determined by all of the following factors except:

    Solutions

    Reaction rates are determined by all of the following factors

    (i) the number of collisions between molecules

    (ii) the force of collisions between molecules and

    (iii) the orientation of collisions between molecules.

    so, the spontaneity of the reaction is the correct option.

  • Question 2/4
    4 / -1

    In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

    Solutions

    0.8 M to 0.4 M 15 min t1/2 

    0.10 ï 0.050 1/2  ï 0.025

    2 × t1/2 = 30 min

  • Question 3/4
    4 / -1

    Consider the reaction, 2A + B → Products. When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is

    Solutions

    When concentration of B is doubled, the half- life did not change, which means reaction is of first order w.r.t B. When concentration of A is doubled, reaction rate is doubled which means reaction is first order w.r.t A.

    Hence overall order of reaction is 1+1=2.

    So, unit of rate constant is L mol–1s–1.

  • Question 4/4
    4 / -1

    The plot of log k versus 1/T is linear with a slope of

    Solutions

    The variation of rate constant is given by k = A exp(ïEa/RT) or log k = log A 

    ï Ea/(2.303 RT). The slope of plot of log k versus 1/T is ïEa/2.303 R.

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