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NEET Chemistry MCQ
Chemical Kinetics Mcq Neet Chemistry
Quiz 3
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Q.1
Among which of the following factor the specific reaction rate of a first order reaction depends on ...[ AFMC 2003]
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a) temperature
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b) concentration of reactant
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c) pressure
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d) volume
Explanation
Answer : (a)
Q.2
According to the law of mass action, rate of a chemical reaction is proportional to ..[ AFMC 2005]
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a) concentration of reactants
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b) molar concentration of reactants
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c) concentration of products
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d) molar concentration of products
Explanation
Answer : (b)
Q.3
The hypothetical reaction A2 + B2 → 2AB, follows the following mechanism A2 ⇄ A +A (fast) A + B2 → AB + B (slow) A + B → AB (fast) The order of the overall reaction is ....[Pb.PMT 1991]
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a) zero
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b) 1
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c) 2
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d) 3/2
Explanation
Slowest step is rate determining which is second step ∴ Rate = k[A]B2] ...(i) Form first step A2 ⇄ A + A From (i) and (ii) Answer : (d)
Q.4
If the concentration of reactants is increased by a factor (x), the rate constnat k becomes:
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a) ek/x
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b) k/x
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c) k
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d) kx
Explanation
Rate constant is independent of the concentration of reactant Answer : (c)
Q.5
In a reaction, 2A2 + B2 → 2A2B, the reactant A will disappear at ...
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a) half the rate that B will decrease
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b) the same rate that B will decrease
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c) double the rate that A2B will form
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d) twice the rate that B will decrease
Explanation
Answer : (d)
Q.6
Assertion The order of the reaction CH3COOC2H5 + H2O ⇒ CH3COOH + C2H5OH is 2 Reason The molecularity of this reaction is 2
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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
Given reaction is pseudo-first order reaction Answer : (d)
Q.7
The activation energy of a reaction is zero. The rate constant of the reaction
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a) increases with increase of temperature
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b) decreases with decrease of temperature
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c) decreases with increase of temperature
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d) is nearly independent of temperature
Explanation
Answer : (d)
Q.8
If the reaction rate at a given temperature become slower then
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a) the free energy of activation is higher
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b) the free energy of activation is lower
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c) the entropy changes
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d) the initial concentration of reactants remain constant
Explanation
Greater is the activation energy slower is the rate of reaction Answer : (a)
Q.9
The rate of reaction depends upon the ...[ BHU 1998]
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a) pressure
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b) volume
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c) concentration of reactants
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d) force
Explanation
Among the given options, rate will depend on concentration of reactant. Answer : (c)
Q.10
For the reaction, 2N2O5 → 4NO2 +O2 rate of reaction is ... [ AIIMS 2006]
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a)
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b)
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c)
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d)
Explanation
Answer : (c)
Q.11
In the reaction : A + 2B → C + 2D the initial rate at t=0 was found to be 2.6×10-2 M sec-What is the value of rate of disappearance of B at t=0 in M sec-1
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a) 2.6×10-2 M sec-1
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b)5.2×10-2 M sec-1
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c) 1.0×10-1 M sec-1
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d) 6.5×10-3 M sec-1
Explanation
Answer : (b)
Q.12
Assertion The order of a reaction can have fractional value Reason The order of a reaction cannot be written from balanced equation of a reaction ...[ AIIMS 2008]
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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.13
Graph between logk and (1/T) is linear of slope S. Hence Ea is...[ CBSE 2002]
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a) R ×S
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b) S/R
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c) R/S
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d) 2.303 RS
Explanation
Arrhenius equation comparing above equation with standard equation of line y=Mx + c , here M is slope we get Thus Ea = 2.303 RS Answer : (d)
Q.14
For a first order reaction k=10-4 sec-1, the time of (1/4)th life will be
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a) 0.693×104 sec
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b) 1.386 ×104 sec
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c) 2.303 ×104 sec
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d) 0.301×104 sec
Explanation
R = R0 / 4 form formula Answer : (b)
Q.15
For the reaction, 2NO → N2 + O2, the expression represents
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a) the rate of formation of NO
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b) the average rate of the reaction
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c) the instantaneous rate of the reaction
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d) none of the above
Explanation
Answer : (c)
Q.16
The rate law for the reaction,Mbr/> RCl + NaOH(aq.) → ROH + NaCl is given by, Rate = k[RCl]. The rate of reaction will be
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a) unaffected by increasing temperature of the reaction
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b) doubled on doubling the concentration of NaOH
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c) halved on reducing the concentration of NaOH to one half
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d) halved on reducing the concentration of RCl to one half
Explanation
Answer : (d)
Q.17
The reaction, X → Y (product) follows first order kinetics. In 40 minutes, the concentration of X changes from 0.1M to 0.025M, then the rate of reaction when concentration of X is 0.01M is
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a) 3.47 × 10-4 M/min
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b) 3.47 × 10-5 M/min
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c) 1.73 ×10-4 M/min
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d) 1.73 ×10-5 M/min
Explanation
Use formula to find k Substitute R= 0.1M ,R0= 0.025M on simplification we get k=0.03466 Now rate = k × (concentration 0.01M) rate = 3.47 × 10-4 M/min Answer : (a)
Q.18
tion Positive catalysts increases the rate of reaction Reason Catalysts decreases the value of ΔGo
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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 : (c)
Q.19
A certain zero order reaction has k=0.015 Ms-1 for the disappearance of A. What will be the concentration of A after 20 seconds if the initial concentration is 0.5M?
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a) 0.1 M
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b) 0.2 M
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c) 0.125 M
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d) 0.25 M
Explanation
For zero order reaction reactant consumed (x) x = kt x = 0.015 × 20 =0.3 M Remaining conc. = 0.5-0.3 = 0.2 M Answer : (b)
Q.20
The rate constant of a reaction depends on ...[ BHU 2003]
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a) the temperature of a reaction
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b) the time of a reaction
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c) the extent of reaction
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d) the initial concentration of the reactant
Explanation
Answer : (c)
Q.21
For a gaseous reaction, following data is given The temperature at which k1 = k2 is
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a) 2000 K
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b) 432.2 K
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c) 1000 K
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d) 868.82 K
Explanation
From Arrhenius equation When k1 = k2 Answer : (b)
Q.22
Which of the following rate laws has an overall order of 0.5 for the reaction involving substances x, y and z?
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a) Rate = k[Cx][Cy][Cz]
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b) Rate = k[Cx]0.5[Cy]0.5[Cz]0.5
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c) Rate = k[Cx]1.5[Cy]-1[Cz]0
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d) Rate = k[Cx][Cy]-2[Cz]0
Explanation
Answer : (c)
Q.23
The half-life of a first order reaction having rate constant k=1.7×10-5 sec-1 is ...[ JIPMER 2006]
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a) 12.1 hrs
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b) 9.7 hrs
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c) 11.3 hrs
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d) 1.8 hrs
Explanation
use formula for half-life of 1sth order reaction Answer : (c)
Q.24
From the following data, the activation energy for the reaction (cal/mol) is
T(K)
1/T
log K
769
1.3×10
-3
2.9
667
1.5×10
-3
1.1
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d) 3×104
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a) 2 × 104
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b) 2 × 104
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c) 8 ×104
Explanation
Answer : (a)
Q.25
The activation energy of a reaction can be lowered by...
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a) using a positive catalyst
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b) increasing temperature
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c) decreasing temperature
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d) increasing concentration of the reactants
Explanation
Answer : (a)
Q.26
90% of the first order reaction is completed in 60 minutes. The velocity constant of the reaction is ...[ KCET 2008]
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a) 0.0383 min-1
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b) 0.383 min-1
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c) 0.0766 min-1
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d) 0.0192 min-1
Explanation
Unreacted reactant = 100 -90 =10% Answer : (a)
Q.27
The unit of rate constant obeying the rate expression r=k[A][B]2/3 is
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a) mol-2/3 litre2/3 time-1
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b) mol2/3 litre-2/3 time-1
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c) mol-5/3 litre5/3 time-1
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d) none of these
Explanation
n = 1 +(2/3) = 5/3 Answer : (a)
Q.28
The number of molecules of the reactants taking part in a single step of the reaction tells about ...[ AMU 1992]
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a) molecularity of the reaction
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b) mechanism of the reaction
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c) order of reaction
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d) all of the above
Explanation
If a reaction takes place in single step then total number of reactant molecules in balanced stoichiometric equation gives its molecularity Answer : (a)
Q.29
75% of a first order reaction was completed in 32 min, when was 50% of the reaction completed? [ BHU 2007]
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a) 24 min
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b) 16 min
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c) 8 min
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d) 48 min
Explanation
First half time 50% or 50% completed Second half-time = 25% or 75% completed 2 × halftime = 32 min half-period = 16 min Answer : (b)
Q.30
According to collision theory
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a) all collisions are sufficiently violent
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b) all collisions are responsible for product formation
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c) all collisions are effective
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d) only fraction of collisions are effective which have enough energy to form products
Explanation
Answer : (d)
0 h : 0 m : 1 s
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