Q.1
Among which of the following factor the specific reaction rate of a first order reaction depends on ...[ AFMC 2003]
  • a) temperature
  • b) concentration of reactant
  • c) pressure
  • d) volume
Q.2
According to the law of mass action, rate of a chemical reaction is proportional to ..[ AFMC 2005]
  • a) concentration of reactants
  • b) molar concentration of reactants
  • c) concentration of products
  • d) molar concentration of products
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]
  • a) zero
  • b) 1
  • c) 2
  • d) 3/2
Q.4
If the concentration of reactants is increased by a factor (x), the rate constnat k becomes:
  • a) ek/x
  • b) k/x
  • c) k
  • d) kx
Q.5
In a reaction, 2A2 + B2 → 2A2B, the reactant A will disappear at ...
  • a) half the rate that B will decrease
  • b) the same rate that B will decrease
  • c) double the rate that A2B will form
  • d) twice the rate that B will decrease
Q.6
Assertion The order of the reaction CH3COOC2H5 + H2O ⇒ CH3COOH + C2H5OH is 2 Reason The molecularity of this reaction is 2
  • 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.7
The activation energy of a reaction is zero. The rate constant of the reaction
  • a) increases with increase of temperature
  • b) decreases with decrease of temperature
  • c) decreases with increase of temperature
  • d) is nearly independent of temperature
Q.8
If the reaction rate at a given temperature become slower then
  • a) the free energy of activation is higher
  • b) the free energy of activation is lower
  • c) the entropy changes
  • d) the initial concentration of reactants remain constant
Q.9
The rate of reaction depends upon the ...[ BHU 1998]
  • a) pressure
  • b) volume
  • c) concentration of reactants
  • d) force
Q.10
For the reaction, 2N2O5 → 4NO2 +O2 rate of reaction is ... [ AIIMS 2006]
  • a)
    ch-11_qn-70choice_img_no1.png
  • b)
    ch-11_qn-70choice_img_no2.png
  • c)
    ch-11_qn-70choice_img_no3.png
  • d)
    ch-11_qn-70choice_img_no4.png
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
  • a) 2.6×10-2 M sec-1
  • b)5.2×10-2 M sec-1
  • c) 1.0×10-1 M sec-1
  • d) 6.5×10-3 M sec-1
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]
  • 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.13
Graph between logk and (1/T) is linear of slope S. Hence Ea is...[ CBSE 2002]
  • a) R ×S
  • b) S/R
  • c) R/S
  • d) 2.303 RS
Q.14
For a first order reaction k=10-4 sec-1, the time of (1/4)th life will be
  • a) 0.693×104 sec
  • b) 1.386 ×104 sec
  • c) 2.303 ×104 sec
  • d) 0.301×104 sec
Q.15
For the reaction, 2NO → N2 + O2, the expression represents
ch-11_que_no-75_img_no1.png
  • a) the rate of formation of NO
  • b) the average rate of the reaction
  • c) the instantaneous rate of the reaction
  • d) none of the above
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
  • a) unaffected by increasing temperature of the reaction
  • b) doubled on doubling the concentration of NaOH
  • c) halved on reducing the concentration of NaOH to one half
  • d) halved on reducing the concentration of RCl to one half
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
  • a) 3.47 × 10-4 M/min
  • b) 3.47 × 10-5 M/min
  • c) 1.73 ×10-4 M/min
  • d) 1.73 ×10-5 M/min
Q.18
tion Positive catalysts increases the rate of reaction Reason Catalysts decreases the value of ΔGo
  • 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.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?
  • a) 0.1 M
  • b) 0.2 M
  • c) 0.125 M
  • d) 0.25 M
Q.20
The rate constant of a reaction depends on ...[ BHU 2003]
  • a) the temperature of a reaction
  • b) the time of a reaction
  • c) the extent of reaction
  • d) the initial concentration of the reactant
Q.21
For a gaseous reaction, following data is given The temperature at which k1 = k2 is
ch-11_que_no-80_img_no1.png
  • a) 2000 K
  • b) 432.2 K
  • c) 1000 K
  • d) 868.82 K
Q.22
Which of the following rate laws has an overall order of 0.5 for the reaction involving substances x, y and z?
  • a) Rate = k[Cx][Cy][Cz]
  • b) Rate = k[Cx]0.5[Cy]0.5[Cz]0.5
  • c) Rate = k[Cx]1.5[Cy]-1[Cz]0
  • d) Rate = k[Cx][Cy]-2[Cz]0
Q.23
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
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
  • d) 3×104
  • a) 2 × 104
  • b) 2 × 104
  • c) 8 ×104
Q.25
The activation energy of a reaction can be lowered by...
  • a) using a positive catalyst
  • b) increasing temperature
  • c) decreasing temperature
  • d) increasing concentration of the reactants
Q.26
90% of the first order reaction is completed in 60 minutes. The velocity constant of the reaction is ...[ KCET 2008]
  • a) 0.0383 min-1
  • b) 0.383 min-1
  • c) 0.0766 min-1
  • d) 0.0192 min-1
Q.27
The unit of rate constant obeying the rate expression r=k[A][B]2/3 is
  • a) mol-2/3 litre2/3 time-1
  • b) mol2/3 litre-2/3 time-1
  • c) mol-5/3 litre5/3 time-1
  • d) none of these
Q.28
The number of molecules of the reactants taking part in a single step of the reaction tells about ...[ AMU 1992]
  • a) molecularity of the reaction
  • b) mechanism of the reaction
  • c) order of reaction
  • d) all of the above
Q.29
75% of a first order reaction was completed in 32 min, when was 50% of the reaction completed? [ BHU 2007]
  • a) 24 min
  • b) 16 min
  • c) 8 min
  • d) 48 min
Q.30
According to collision theory
  • a) all collisions are sufficiently violent
  • b) all collisions are responsible for product formation
  • c) all collisions are effective
  • d) only fraction of collisions are effective which have enough energy to form products
0 h : 0 m : 1 s