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NEET Chemistry MCQ
Chemical Kinetics Mcq Neet Chemistry
Quiz 6
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Q.1
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
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a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
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b) The Assertion and Reason are true but Reason is not correct explanation of Assertion
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c) Assertion is true but, Reason is false
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d) Assertion is false but, Reason is true
Explanation
Answer : (b)
Q.2
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 ...
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a) 20%
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b) 50%
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c) 60%
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d) 100%
Explanation
Answer : (d)
Q.3
The rate of reaction increases with rise in temperature because of ...[ Karnataka PMT 2008]
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a) increase in the number of activated molecules
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b) increase in activation energy
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c) decrease in the activation energy
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d) increase in the number of molecular collision
Explanation
When temperature increases the number of collisions amount reactant molecules per unit time increases. Hence rate of reaction also increases Answer : (d)
Q.4
For a reaction Ea=0 and k=2.3×104s-1 at 300k. the value of k at 310K would be
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a) 6.4×104 s-1
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b) 2.3×104s-1
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c) 3.2×108s-1
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d) 3.2×105s-1
Explanation
From Arrhenius equation Given Ea = 0 thus k=A= constant k310=k300 = 2.3×104s-1 Answer : (b)
Q.5
For the decomposition of HI at 1000K 2HI → H2 + I2, the following data were obtained The oder of the reaction is
[HI],M
Rate of decomposition of HI(mol L
-1
s
-1
)
0.1
2.75×10
-8
0.2
11×10
-8
0.3
24.75×10
-8
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a) 0
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b) 1
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c) 1.5
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d) 2
Explanation
Only one reactant thus Rate = k[HI]n 11×10-8 = k[0.2]n ...(i) 2.75×10-8 = k[0.1]n ...(ii) from (i) and (ii) 4 =2n, n=2 Answer : (d)
Q.6
The rate of chemical reaction depends on ...[ AFMC 2002]
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a) pressure
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b) time
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c) concentration
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d) all of these
Explanation
Answer : (c)
Q.7
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 ...
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a) less than ΔH
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b) zero
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c) more than ΔH
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d) equal to ΔH
Explanation
Answer : (c)
Q.8
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]
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a) (i) and (iv)
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b) (ii) and (v)
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c) (ii) and (iii)
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d) (i) and (v)
Explanation
Answer : (b)
Q.9
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]
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a) log k vs T-1
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b) k vs T
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c)
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d)
Explanation
From equation If we plot a graph log k against (1/T) we get straight line with from the value of slope we can calculate Ea Answer : (a)
Q.10
A first order reaction has half-life of 3 hrs. What percentage of the reactant will remain after 8 hrs?
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a) 118.26%
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b) 15.76%
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c) 45.5%
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d) 68.2%
Explanation
From formula for k and half life of first order reaction Answer : (b)
Q.11
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]
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a) 1.5
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b) 2.0
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c) 2.5
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d) 3.0
Explanation
Let Rate = k[A]p 2.4 = k[2.2]p ... (i) 0.6 = k[1.1]p ... (ii) On dividing (i) by (ii) we get 4 = [2]p p= 2 Answer : (b)
Q.12
Consider the endothermic reaction X → Y with the activation energies Eb and Ef for backward and forward reactions, respectively. In general
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a) Eb < Ef
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b) Eb > Ef
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c) Eb = Ef
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d) there is no definite relation between Ef and Eb
Explanation
Answer : (a)
Q.13
For the reaction N2(g) + 3H2(g) → 2NH3(g), if then value of
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a) 1×10-4 mol L-1 s-1
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b) 3×10-4 mol L-1 s-1
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c) 4×10-4 mol L-1 s-1
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d) 6×10-4 mol L-1 s-1
Explanation
Answer : (b)
0 h : 0 m : 1 s
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