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UHS Past Papers /
Chemistry /
Chap No 8 /
Quiz 2

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MDCAT - UHS Past Papers - Chemistry - Chap No 8 Quiz

Attempt 10 MCQs on MDCAT - UHS Past Papers - Chemistry - Chap No 8 | Quiz 2

11. If a reactant/product can absorb UV, visible or IR radiation, then the rate of reaction is best measured by:

Chemical method
Spectrometry
Graphical method
Differential method

12. If rate constant k = 0.693 min⁻¹, what is the half-life for the 1st order reaction?

1 min
2 min
0.693 min
4 min

13. Half-life of N₂O₅ at 0°C is 24 min. How long will it take for a sample to decay to 25% of its original concentration?

24 min
72 min
120 min
48 min

14. According to collision theory of bimolecular reaction in gas phase, the minimum amount of energy required for an effective collision is known as:

Heat of reaction
Rate of reaction
Has no effect on reaction
Energy of activation

15. If the energy of activation of a chemical reaction is very low, the rate of that chemical reaction is observed to be very high because:

Reaction proceeds without any transition state
Number of efficient or fruitful collisions increases
Concentration of the reactants becomes irrelevant
Molecules of the reactants move slowly

16. What is the measure of activation energy in an endothermic reaction?

Activation energy of forward is less than that of backward reaction
Activation energy of forward and backward reaction is same
Activation energy of backward reaction is less than that of forward reaction
Activation energy of backward reaction is more than that of forward reaction

17. Which of the following is correct Arrhenius Equation?

K = Ae^(-Ea)
K = Ae^RT
K = Ae^(-Ea/RT)
K = Ae^UT

18. The catalysis in which the catalyst and the reactants are in the same phase is known as:

Heterogeneous catalyst
Homogeneous catalyst
Slow
Fast

19. 2A+B=3C+D which of the following does not express the reaction rate?

-d[B]/dt
d[D]/dt
-1/2 d[A]/dt
-1/3 d[C]/dt

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