Q.1
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.2
The rate of reaction depends upon the ...[ BHU 1998]
  • a) pressure
  • b) volume
  • c) concentration of reactants
  • d) force
Q.3
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.4
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.5
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.6
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.7
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.8
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.9
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.10
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.11
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.12
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.13
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.14
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.15
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.16
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.17
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.18
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.19
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.20
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
Q.21
For N2(g) + 3 NH3(g) → 2NH3(g) +22kcl. Ea for the reaction is 70kcal. Hence, the activation energy for 2NH3)g) → N2(g) + 3H2 is
  • a) 92 kcal kcl
  • b) 46 kcal
  • c) 184 kcal
  • d) 48 kcal
Q.22
In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled and rate increases by a factor of 8 when the concentration of both the reactants (A and B) are doubled, rate law for the reaction can be written as
  • a) Rate = k[A][B]2
  • b) Rate = k[A]2[B]2
  • c) Rate = k[A][B]
  • d) Rate = k[A]2[B]
Q.23
Assertion In rate laws, the exponents for concentration do not necessarily match the stoichiometric coefficients Reason It is the mechanism and not the balanced chemical equation for the overall change that governs the reaction rate
  • 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.24
For a reaction A+B → C + D, if the concentration of A is doubled without altering the concentration of B, the rate gets doubled. If the concentration of B is increased by nine times without altering the concentration of A, the rate gets tripled. The order of the reaction is
  • a) 1
  • b) 0
  • c) 3/2
  • d) 2
Q.25
The rate of reaction A + B → Product, is given by the equation, r=k[A][B]. If B is taken in large excess the order of the reaction would be :
  • a) zero
  • b) 1
  • c) 2
  • d) none of the above
Q.26
The function of catalyst in chemical reaction is to ...[ AFMC 1995]
  • a) increase the product
  • b) decrease the product
  • c) accelerate the rate of reaction
  • d) increase the reactants
Q.27
Ina zero order reaction for every 10°C rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of reaction will become ...[ AIPMT 2012]
  • a) 64 times
  • b) 128 times
  • c) 256 times
  • d) 512 times
Q.28
The rate constant is numerically the same for three reactions of first, second and third order respectively. Which one is true for the rates of the three reactions if the concentration of the reactant is greater than 1M?
  • b) r1 > r2 > r3
  • c) r1 < r2 < r3
  • d) all of these
  • a) r₁ = r₂=r₃
Q.29
On introducing a catalyst at 500K, the rate of a first order reaction increases by 1.718 times. The activation energy in the presence of a catalyst is 6.05kJmol-the slope of the plot of lnk(sec-1) against 1/T in the absence of catalyst is ...
  • a) +1
  • b) -1
  • c) +1000
  • d) -1000
Q.30
The temperature coefficient of a reaction is ...
  • a) ratio of rate constants at two temperatures differing by 1°C
  • b) specific reaction rate at 25°C
  • c) ratio of rate constants at temperature 30°C and 25°C
  • d) ratio of rate constants at temperature 35°C and 25°C
0 h : 0 m : 1 s