Q.1
Assertion Order can be different from molecularity of a reaction Reason Slow step is the rate determining step and may involve lesser number of reactants
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
  • c) Assertion is true but, Reason is false
  • d) Assertion is false but, Reason is true
Q.2
3A → 2B, rate of reaction is equals to ...[ CBSE 2002]
  • a)
    ch-11_qn-140choice_img_no1.png
  • b)
    ch-11_qn-140choice_img_no2.png
  • c)
    ch-11_qn-140choice_img_no3.png
  • d)
    ch-11_qn-140choice_img_no4.png
Q.3
The activation energy for a simple chemical reaction A → B is Ea, in forward direction. The activation energy for reverse reaction ...[ CBSE 2003]
  • a) can be less than or more than Ea
  • b) if always double of Ea
  • c) is negative of Ea
  • d) is always less than Ea
Q.4
The rate of a chemical reaction
  • a) increases as the reaction proceeds
  • b) decreases as the reaction proceeds
  • c) may increases or decreases during the reaction
  • d) remains constant as the reaction proceeds
Q.5
In a first order reaction A → P, the ratio of R0/R was found to be 8 after 60 minutes. If concentration is 0.1M, then the rate of reaction in moles of A reacted per minute is ...[ AIIMS 1996]
  • a) 2.226×10⁻³ mol litre-1 min-1
  • b) 3.466×10⁻³ mol litre-1 min-1
  • c) 4.455×10⁻³ mol litre-1 min-1
  • d) 5.532×10⁻³ mol litre-1 min-1
Q.6
The specific rate constant of a first order reaction depends on ...[ AFMC 2001]
  • a) time
  • b) temperature
  • c) concentration of product
  • d) concentration of the reactants
Q.7
If a first order reaction takes 32 minutes for 80% completion, then time required for 50% completion is ...[ AMU 2006]
  • a) 1.386 min
  • b) 13.86 min
  • c) 8 min
  • d) 4 min
Q.8
For which of the following, the units of rate and rate constant of the reaction are identical?
  • a) zero order
  • b) first order
  • c) second order
  • d) third order
Q.9
According to the collision theory of reation rates, the rate of reaction increases with temperature due to
  • a) decrease in the activation energy
  • b) greater number of collisions
  • c) higher velocity of reacting ,molecules
  • d) greater number of molecules having the activation energy
Q.10
Activation energy (Ea) and rate constant (k1 and k2) of a chemical reaction at two different temperatures (T1 and T2) are related by ...[ AIPMT 2012]
  • a)
    ch-11_qn-148choice_img_no1.png
  • b)
    ch-11_qn-148choice_img_no2.png
  • c)
    ch-11_qn-148choice_img_no3.png
  • d)
    ch-11_qn-148choice_img_no4.png
Q.11
Assertion If the activation energy of a reaction is zero, temperature will have no effect on the rate constant Reason Lower the activation energy, faster is the reaction
  • a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
  • c) Assertion is true but, Reason is false
  • d) Assertion is false but, Reason is true
Q.12
The activation energy for a hypothetical reaction A → Product is 12.49 kcal/mol. If temperature is raised from 295 to 305, the rate of reaction increases by ...
  • a) 20%
  • b) 50%
  • c) 60%
  • d) 100%
Q.13
The rate of reaction increases with rise in temperature because of ...[ Karnataka PMT 2008]
  • a) increase in the number of activated molecules
  • b) increase in activation energy
  • c) decrease in the activation energy
  • d) increase in the number of molecular collision
Q.14
For a reaction Ea=0 and k=2.3×104s-1 at 300k. the value of k at 310K would be
  • a) 6.4×104 s-1
  • b) 2.3×104s-1
  • c) 3.2×108s-1
  • d) 3.2×105s-1
Q.15
The rate of chemical reaction depends on ...[ AFMC 2002]
  • a) pressure
  • b) time
  • c) concentration
  • d) all of these
Q.16
For an endothermic reaction, where, ΔH represents the enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be ...
  • a) less than ΔH
  • b) zero
  • c) more than ΔH
  • d) equal to ΔH
Q.17
Consider the following statements ...] i)increase in concentration of reactant increases the rate of a zero order relation ii)rate constant k is equal to collision frequency 'A' if Ea = 0 iii)rate constant k is equal to collision frequency 'A' if Ea = ∞ iv)logek vs T is a straight line v) loge vs 1/T is a straight line correct statement are ... [ Keranata PMT 2010]
  • a) (i) and (iv)
  • b) (ii) and (v)
  • c) (ii) and (iii)
  • d) (i) and (v)
Q.18
The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation. k=A.e-Ea. Activation energyEa of the reaction can be calculated by plotting ...[ CBSE 2003]
  • a) log k vs T-1
    ch-11_qn-159choice_img_no3.png
  • b) k vs T
    ch-11_qn-159choice_img_no4.png
  • c)
  • d)
Q.19
A first order reaction has half-life of 3 hrs. What percentage of the reactant will remain after 8 hrs?
  • a) 118.26%
  • b) 15.76%
  • c) 45.5%
  • d) 68.2%
Q.20
For reaction aA → xP, where [A] = 2.2 m-M, the rate was found to 2.4 mMs-On reducing concentration of A to half, the rate changes to 0.5 mMs-The order of reaction with respect toA is ...[ AIIMS 2005]
  • a) 1.5
  • b) 2.0
  • c) 2.5
  • d) 3.0
Q.21
Consider the endothermic reaction X → Y with the activation energies Eb and Ef for backward and forward reactions, respectively. In general
  • a) Eb < Ef
  • b) Eb > Ef
  • c) Eb = Ef
  • d) there is no definite relation between Ef and Eb
Q.22
For the reaction N2(g) + 3H2(g) → 2NH3(g), if then value of
ch-11_que_no-163_img_no1.png
ch-11_que_no-163_img_no2.png
  • a) 1×10⁻⁴ mol L-1 s-1
  • b) 3×10⁻⁴ mol L-1 s-1
  • c) 4×10⁻⁴ mol L-1 s-1
  • d) 6×10⁻⁴ mol L-1 s-1
Q.23
The rate constant for a first order reaction is 4.606 × 10⁻³ s-The time required to reduce 2.0 g of the reactant to 0.2 g is : ... [NEET 2020]
  • a) 500 s
  • b) 1000 s
  • c) 100 s
  • d) 200 s
Q.24
The rate constant of a first order reaction is 6×10⁻³ s-If the initial concentration is 0.1M, the initial rate of reaction is .... [ BHU 1996]
  • a) 6 ×10⁻³ Ms-1
  • b) 6 ×10⁻⁴ Ms-1
  • c) 6 ×10⁻⁶ Ms-1
  • d) 6 ×10⁻⁸ Ms-1
Q.25
A first order reaction 2N2O(g) → 2N2(g) + O2(g) has a rate constant of 1.3×10⁻¹¹ s-1 at 270°C and 4.5×10⁻¹⁰ s-1 at 350°C. What is the activation energy for this reaction?
  • a) 15 kJ
  • b) 30 kJ
  • c) 120 kJ
  • d) 240 kJ
Q.26
A substance reacts according to first order kinetics. the rate constant for the reaction is 1×10⁻² sec-Its initial concentration is 1M. Its initial rate is ...[ BHU 2002]
  • a) 2×102 Ms-1
  • b) 1×102 Ms-1
  • c) 1×10⁻² Ms-1
  • d) 2×10⁻² Ms-1
Q.27
For the reaction N2O5(g) → 2NO2(g) + ½O2(g) the value of rate of disappearance of N2O5 is given as 6.25×10⁻³ mol L-1s-The rate of formation of NO2 and O2 is given respectively as ...[ CBSE 2010]
  • a) 6.25×10⁻³ mol L-1 s-1 and 6.25 ×10⁻³ mol L-1 s-1
  • b) 1.25×10⁻²mol L-1 s-1 and 3.125×10⁻³mol L-1 s-1
  • c) 6.25×10⁻³ mol L-1 s-1 and 3.125 ×10⁻³ mol L-1 s-1
  • d) 1.25×10⁻² mol L-1 s-1 and 6.25 ×10⁻³ mol L-1 s-1
Q.28
The half-life of a first order reaction having rate constant k=2.1×10⁻⁵ sec⁻¹ is ...[ JIPMER 2006]
  • a) 3.27 hr
  • b) 6 hr
  • c) 8.12hr
  • d) 9.17hr
Q.29
Identify the order of reaction whose rate constant is k=3.2×10⁻⁵L mol-1 s-1
  • a) 0
  • b) 1
  • c) 2
  • d) 3
Q.30
The half-life of a first order reaction having rate constant k=1.7×10⁻⁵ sec⁻¹ is ...[ JIPMER 2006]
  • a) 12.1 hrs
  • b) 9.7 hrs
  • c) 11.3 hrs
  • d) 1.8 hrs
0 h : 0 m : 1 s