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Reaction Kinetics /
Quiz 10

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NCAT - Practice Test - Chemistry - Reaction Kinetics Quiz

Attempt 10 MCQs on NCAT - Practice Test - Chemistry - Reaction Kinetics | Quiz 10

91. What are the units of A for a first-order reaction?

s^{-1}
L mol^{-1} s^{-1}
mol L^{-1} s^{-1}
dimensionless

92. If t_{1/2}=30 min, time for 87.5% decay?

90 min
60 min
120 min
30 min

93. What order is observed when enzyme active sites are saturated?

Zero-order
First-order
Second-order
Third-order

94. What is the exponential form of first-order integrated law?

[A]_t = [A]_0 e^{-kt}
[A]_t = [A]_0 - kt
[A]_t = [A]_0 / (1+ kt[A]_0)
[A]_t = [A]_0 (1 - e^{-kt})

95. How does zero-order half-life depend on initial concentration?

Proportional to initial concentration
Constant
Inversely proportional
Independent

96. What type of decay occurs for first-order reactions?

Exponential decay
Linear decay
Quadratic decay
Sigmoidal decay

97. What is the main use of Arrhenius equation?

Predict rate constant change
Predict equilibrium shift
Predict activation energy
Predict order of reaction

98. How is the rate law determined?

Experimental determination
Theoretical calculation
Balanced equation gives order
Molecularity equals order

99. Is activation energy always positive?

Can be zero
Always positive
Always negative
Always > 0

100. What does the intercept of an Arrhenius plot represent?

Intercept = ln A
Intercept = -Ea/R
Slope = ln A
Slope = -Ea

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