Differential and Integral Forms of Zero and First-Order Reactions and their Characteristics and Half-Lives NEET Questions

Physical Chemistry - Chemical Kinetics

Differential and Integral Forms of Zero and First-Order Reactions and their Characteristics and Half-Lives MCQ Questions


13.
Decomposition of NH₃ on a hot platinum surface follows:
A.
Pseudo first order kinetics
B.
Zero order kinetics
C.
Second order kinetics
D.
First order kinetics
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ANSWER :
B. Zero order kinetics
14.
Photochemical reactions of constant light intensity (e.g., H₂ + Cl₂ → 2HCl in sunlight) often show:
A.
Zero order kinetics
B.
Second order kinetics
C.
Fractional order
D.
First order kinetics
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ANSWER :
A. Zero order kinetics
15.
For a zero order reaction, the time required for completion of the reaction (100%) is:
A.
[A]₀/(2k)
B.
[A]₀/k
C.
0.693/k
D.
Infinite time
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ANSWER :
B. [A]₀/k
16.
For a zero order reaction, the time required for 75% completion is how many times the half-life?
A.
3 times
B.
0.5 times
C.
1.5 times
D.
2 times
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ANSWER :
C. 1.5 times
17.
In a zero order reaction, if 50% of reactant is consumed in 10 minutes, the time for 100% consumption is:
A.
40 minutes
B.
15 minutes
C.
30 minutes
D.
20 minutes
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ANSWER :
D. 20 minutes
18.
The rate of a zero order reaction A → B is 0.02 mol L⁻¹ s⁻¹. If [A]₀ = 0.5 M, the time required to complete the reaction is:
A.
25 s
B.
50 s
C.
10 s
D.
100 s
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ANSWER :
A. 25 s