JEE Questions for Chemistry Chemical Kinetics Quiz 11 - MCQExams.com

In the reaction, P + Q → R + S the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q. Q varies with reaction time as shown in the figure. The overall order of the reaction is
Chemistry-Chemical Kinetics-1904.png
  • 2
  • 3
  • 0
  • 1

Chemistry-Chemical Kinetics-1906.png
  • 2
  • 3
  • 5
  • 9
For the second order reaction, A + B → products. When a moles of A react with b moles of B, the rate equation is given by
Chemistry-Chemical Kinetics-1908.png
  • first order
  • zero order
  • unchanged, second order
  • third order
For a first order reaction, a plot of log (a – x) against time is a straight line with a negative slope equal to

  • Chemistry-Chemical Kinetics-2002.png
  • 2)
    Chemistry-Chemical Kinetics-2003.png

  • Chemistry-Chemical Kinetics-2004.png

  • Chemistry-Chemical Kinetics-2005.png
The following data were obtained during the first order decomposition of 2A (g) → B (g) + C (s) at a constant volume and at a particular temperature.
Chemistry-Chemical Kinetics-1910.png
  • 0.0693
  • 69.3
  • 6.93
  • 6.93 × 10-4
Give relation between half reaction time (t1/2) and initial concentration of reactant for (n -order reaction.
  • t1/2 ∝ [R]0
  • 2)
    Chemistry-Chemical Kinetics-1912.png

  • Chemistry-Chemical Kinetics-1913.png

  • Chemistry-Chemical Kinetics-1914.png

Chemistry-Chemical Kinetics-1916.png
  • Only II
  • Both I and II
  • Neither I nor II
  • Only I
For a zero order reaction
  • t1/2 ∝ R0
  • t1/2 ∝ 1/R0
  • t1/2 ∝ R02
  • t1/2 ∝ 1/R02
A reaction was observed for 15 days and the percentage of the reactant remaining after the days indicated was recorded in the following table.
Chemistry-Chemical Kinetics-1918.png
  • Reaction order = First, Half-life (days) = 2
  • Reaction order = First, Half-life (days) = 6
  • Reaction order =Second, Half-life (days) = 2
  • Reaction order = zero, Half-life (days) = 6
  • Reaction order = Third, Half-life (days) = 2
The plot between concentration versus time for a zero order reaction is represented by

  • Chemistry-Chemical Kinetics-1920.png
  • 2)
    Chemistry-Chemical Kinetics-1921.png

  • Chemistry-Chemical Kinetics-1922.png

  • Chemistry-Chemical Kinetics-1923.png
A + B → Product If concentration of A is doubled, rate increases 4 times. If concentrations of A and B both are doubled, rate increases 8 times. The differential rate equation of the reaction will be

  • Chemistry-Chemical Kinetics-1925.png
  • 2)
    Chemistry-Chemical Kinetics-1926.png

  • Chemistry-Chemical Kinetics-1927.png

  • Chemistry-Chemical Kinetics-1928.png
For a reaction between A and B, the initial rate of reaction is measured for various initial concentrations of A and B. The data provided are
Chemistry-Chemical Kinetics-1930.png
  • one
  • two
  • two and half
  • three
Given the hypothetical reaction mechanism
Chemistry-Chemical Kinetics-1932.png
  • step I
  • step II
  • step III
  • step IV

Chemistry-Chemical Kinetics-1933.png
  • 0.5 mol-1 dm-3
  • 1.0 mol dm-3
  • 1.5 mol dm-3
  • 2.0 mol-1 dm3

Chemistry-Chemical Kinetics-1935.png
  • I and II
  • II and III
  • I and III
  • I, II and III
The following data are for the decomposition of ammonium nitrite in aqueous solution.
Chemistry-Chemical Kinetics-1937.png
  • zero
  • one
  • two
  • three
The concentration of a reactant X decreases from 0.1 M to 0.005 M in 40 min. If the reaction follows first order kinetics, the rate of the reaction when the concentration of X is 0.01 M will be
  • 1.73 × 10-4 M min-1
  • 3.47 × 10-4 M min-1
  • 3.47 × 10-5 M min-1
  • 7.5 × 10-4 M min-1
Which one of the following is a second order reaction ?
  • H2 + Br2 → 2HBr
  • NH4NO3 → N2 + 3H2 O

  • Chemistry-Chemical Kinetics-1940.png
  • CH3COOCH3 + NaOH → CH3COONa + CH3OH
Which expression is wrong for first order reaction?

  • Chemistry-Chemical Kinetics-1942.png
  • 2)
    Chemistry-Chemical Kinetics-1943.png

  • Chemistry-Chemical Kinetics-1944.png
  • Rate = k[A]
The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr
Chemistry-Chemical Kinetics-1946.png
  • 1
  • 0
  • 3
  • 2
Which of the following is not the example of pseudo unimolecular reactions ?

  • Chemistry-Chemical Kinetics-1948.png
  • 2)
    Chemistry-Chemical Kinetics-1949.png

  • Chemistry-Chemical Kinetics-1950.png

  • Chemistry-Chemical Kinetics-1951.png
The following homogeneous gaseous reactions were experimentally found to be second order overall.
Chemistry-Chemical Kinetics-1952.png
  • Only III
  • I and III
  • I and IV
  • III and IV
  • I, II and III
The rate law for the chemical reaction
2NO2Cl → 2NO2 + Cl2is
rate = k [NO2][Cl] . The rate determining step is
  • 2NO2Cl → 2NO2 + 2Cl
  • NO2 + Cl2 → NO2Cl + Cl
  • NO2Cl + Cl → NO2 + Cl2
  • NO2Cl → NO2 + Cl

Chemistry-Chemical Kinetics-1955.png
  • s-1, Ms-1 L-1
  • Ms-1 , Ms-1
  • s-1, M-1 s-1
  • Ms-1 , s-1
The rate constant (k1 ) of one of the reaction is found to be double that of the rate constant (k2 ) of another reaction. The relationship between the corresponding activation energies of the two reactions Ea1 and Ea2 will be
  • Ea1 < Ea2
  • Ea1 > Ea2
  • Ea1 = Ea2
  • Ea1= 2Ea2

Chemistry-Chemical Kinetics-1958.png
  • 30 kJ mol-1
  • 40 kJ mol-1
  • 60 kJ mol-1
  • 100 kJ mol-1

Chemistry-Chemical Kinetics-1960.png

  • Chemistry-Chemical Kinetics-1961.png
  • 2)
    Chemistry-Chemical Kinetics-1962.png

  • Chemistry-Chemical Kinetics-1963.png

  • Chemistry-Chemical Kinetics-1964.png
In the given graph the activation energy, Ea for the reverse reaction will be
Chemistry-Chemical Kinetics-1966.png
  • 150 kJ
  • 50 kJ
  • 200 kJ
  • 100 kJ
Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is

  • Chemistry-Chemical Kinetics-1968.png
  • 2)
    Chemistry-Chemical Kinetics-1969.png

  • Chemistry-Chemical Kinetics-1970.png

  • Chemistry-Chemical Kinetics-1971.png
The activation energies of two reactions are E1 and E2 (E1 > E2). If the temperature of the system is increased from T1 to T2 , the rate constant of the reactions changes from k1 to k'1 in the first reaction and k2 to k'2 in the second reaction. Predict which of the following expression is correct ?

  • Chemistry-Chemical Kinetics-1973.png
  • 2)
    Chemistry-Chemical Kinetics-1974.png

  • Chemistry-Chemical Kinetics-1975.png

  • Chemistry-Chemical Kinetics-1976.png

  • Chemistry-Chemical Kinetics-1977.png
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