Chemical Kinetics - Online Test
Q1. Straight line graph for first order reaction is obtained between
Answer : Option B
Explaination / Solution:
Ln[R]=ln[Ro]−kt
Q2. The effect of temperature on reaction rate is given by
Answer : Option C
Explaination / Solution:
k =A exp(-kt)
Q3. The chemical reaction in which reactants require high amount of activation energy are generally
Answer : Option A
Explaination / Solution:
If activation energy is high rate of reaction will decrease and reaction will be slow.
Q4. The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called
Answer : Option B
Explaination / Solution:
The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called threshold energy.
Q5.
The rate of chemical reaction becomes double for every 10o rise in temperature because of
Answer : Option A
Explaination / Solution:
With increase in temperature molecular collisions increases therefore rate of reaction doubles.
Q6. The expression which relates the rate of reaction to the concentration of the reactants are called
Answer : Option B
Explaination / Solution:
Rate law states that rate of reaction is dependent on concentration of reactant raise to power order of reaction.
Q7. The rate is independent of the concentration of the reactants in
Answer : Option A
Explaination / Solution:
−d[R]/dt = k[R]0
Q8. The constant k used in rate equation is known as
Answer : Option B
Explaination / Solution:
Rate constant is also known as velocity constant.
Q9. The radioactive isotope used in determining the age of organic substances is
Answer : Option A
Explaination / Solution:
The ratio of Carbon -12 to Carbon-14 at the moment of death is the same as every other living thing., but Carbon-14 decays and is not replaced. The carbon-14 decays with its half-life of 5770 years., while the amount of Carbon-12 remains constant in the sample. By looking at the ratio of Carbon-12 to Carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely.
Q10. A reaction whose order is different from the actual due to large excess concentration of one of the reactants is called
Answer : Option C
Explaination / Solution:
The concentration of the reactants used in excess remains unaltered during the course of the reaction.
