Rate Constant
Trending Questions
Q. The rate of a first order reaction is 1.8×10−3molL−1min−1, when the initial concentration is 0.3 mol L−1 . The rate constant in the units of second is
- 10−4s−1
- 6×10−2s−1
- 10−2s−1
- 6×102s−1
Q. For the reaction: 2A+B→A2B the rate=k[A][B]2 with k=2.0×10−6 mol−2L2S−1. If the initial concentration of A and B are 0.1 mol L−1 and 0.2 mol L−1 respectively then which of the following is /are correct:
- When A is reduced to 0.06 mol L−1 then rate becomes 3.89×10−9 mol L−1Sec−1
- When A is reduced to 0.06 mol L−1 then B will be 0.16 mol L−1
- All are correct
- Initial rate of reaction is 8×10−9 mol L−1S−1
Q. For the first order decomposition reaction of N2O5, it is observed that
(i)N2O5(g)→2NO2(g)+12O2(g);−d[N2O5]dt=k[N2O5](ii)2N2O5(g)→4NO2(g)+O2(g);−d[N2O5]dt=k′[N2O5]
Which of the following is true?
(i)N2O5(g)→2NO2(g)+12O2(g);−d[N2O5]dt=k[N2O5](ii)2N2O5(g)→4NO2(g)+O2(g);−d[N2O5]dt=k′[N2O5]
Which of the following is true?
- k=k′
- k=k′2
- k=2k′
- k=k′12
Q. A gaseous reaction A(g) ↔ 2B(g) + C(g) is found to be of first order. If the reaction is started with pA = 90 mm Hg, the total pressure after 10 min is found to be 180 mm Hg. The rate constant of the reaction is
- 4.60×10−3s−1
- 4.90×10−3s−1
- 1.15×10−3s−1
- 6.9×10−2s−1
Q. In Samwell's classes, the Maesters made the following statements. He had to figure out how many were right. Can you help him?
Maester 1 said: Rate constant is characteristic of a reaction
Maester 2 said: Rate constant is dependent on temperature
Maester 3 said: Rate constant is not dependent on the catalyst
Maester 1 said: Rate constant is characteristic of a reaction
Maester 2 said: Rate constant is dependent on temperature
Maester 3 said: Rate constant is not dependent on the catalyst
- One was right
- Two were right
- Three were right
- None were right
Q. It is possible to have a reaction where the rate of the reaction increases but the rate constant decreases.
- False
- True
Q.
Mr. Samwell Tarly has to learn Chemistry to become a Maester. He is stuck with Kinetics. Will you help him?
(Maester is just Master in their language)
Choose the appropriate definition of rate constant.- The concentration when rate of reaction is equal to 1 mol L−1 sec−1
- The constant which is added to the rate equation to make everything equal to one.
- The rate of the reaction when concentration of reactants is equal to one.
- The constant which relates rate of reaction to the temperature.
Q. For the non-stoichiometric reaction 2A + B ⟶ C + D. The following kinetic data were obtained in three separate experiments, all at 298 K.
The rate law for the formation of C is :
(IIT-JEE-2014)
Initial concentration (A) | Initial concentration (B) | Initial rate of formation of C (molL1S−1) |
0.1M | 0.1M | 1.2×10−3 |
0.1M | 0.2M | 1.2×10−3 |
0.2M | 0.1M | 2.4×10−3 |
The rate law for the formation of C is :
(IIT-JEE-2014)
dcdt=k[A]
- dcdt=k[A][B]
- dcdt=k[A]2[B]
dcdt=k[A][B]2
Q. The specific rate constant of a first order reaction depends on the:
- concentration of the reactant
- concentration of the product
- time
- temperature
Q.
A reaction : A2+B→ Products, involves the following mechanism :
A2⇌ 2A (fast) (A being the intermediate)
A+B→k2(slow).The rate law consistent to this mechanism is :
rate=k[A2][B]
rate=k[A2]2[B]
rate=k[A2]12[B]
rate=k[A2][B]2