Class 12th chemistry notes
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Q1/10: For a zero-order reaction, the half-life depends on which of the following factors?
Anonymous Quiz
40%
Initial concentration
29%
Final concentration
23%
Reaction time
5%
Volume of the container
Q2/10: What is the unit of the rate constant for a first-order reaction?
Anonymous Quiz
39%
mol L-1 s-1
40%
s-1
20%
mol-1 L s-1
1%
mol L s-1
Q3/10: According to the Arrhenius equation, the slope of the plot of ln k versus 1/T is given by:
Anonymous Quiz
57%
-Ea / R
19%
Ea / R
19%
-R / Ea
5%
R / Ea
Q4/10: Which of the following values can never be the molecularity of an elementary reaction?
Anonymous Quiz
12%
1
20%
2
19%
3
47%
0
Q5/10: Assertion (A): The rate of a chemical reaction always increases with time. Reason (R): The concentration of reactants decreases with time.
Anonymous Quiz
23%
Both A and R are true and R explains A
29%
Both A and R are true but R does not explain A
20%
A is true but R is false
28%
A is false but R is true
Q6/10: A reaction is first order in A and second order in B. How is the rate affected when the concentrations of both A and B are doubled?
Anonymous Quiz
28%
Increases 2 times
26%
Increases 4 times
28%
Increases 8 times
11%
Increases 6 times
Q7/10: The half-life period of a first-order reaction is 138.6 seconds. The value of its rate constant is:
Anonymous Quiz
17%
0.05 s-1
71%
0.005 s-1
10%
0.5 s-1
2%
5.0 s-1
❀1
Q9/10: For the reaction 2A + B -> C + D, the rate of appearance of C is equivalent to:
Anonymous Quiz
15%
-d[A]/dt
15%
d[A]/dt
64%
-1/2 d[A]/dt
6%
-2 d[A]/dt
Q10/10: What is the overall order of a chemical reaction whose rate law is expressed as Rate = k[A]^(1/2) [B]^(3/2)?
Anonymous Quiz
10%
1
62%
2
19%
3
6%
4
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Q1/10: The minimum extra amount of energy required by reacting molecules to get converted into products is called:
Anonymous Quiz
18%
Kinetic energy
18%
Potential energy
51%
Activation energy
10%
Threshold energy