Chemistry XII -Chemical Kinetics 03

Question : 1

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The correct expression for a reaction of 1^st order kinetics is [where [A₀] = initial concentration, [A] = final concentration]

Options:

	[A] = [A0]e–kt
	ln[A] = kt + ln[A0]
	Both (1) & (3)

Solution :

(2)

Correct expression
[A] = [A₀]e^–kt
for 1^st order reaction in exponential form

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Question : 2

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For a second order reaction, the correct graph shown is

Options:

Solution :

(3)

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Question : 3

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For a zero order reaction, if the initial concentration is tripled, the half life period becomes

Options:

	3 times
	Remains unaffected

Solution :

(3)

For zero order reaction t_1/2 ∝ [A0 ]
Hence half life becomes 3 times

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Question : 4

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Find rate constant for a first order reaction if t_99.9% is 1000 minutes

Options:

	100 min–1
	6.93 × 10–3 min–1
	6.93 × 10–4 min–1
	1000 min–1

Solution :

(2)

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Question : 5

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The graph shown below i.e. represents

Options:

	Zero order reaction
	1st order reaction
	2nd order reaction
	3rd order reaction

Solution :

(4)

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Question : 6

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If for a reaction of radioactive decay 20% of the reaction is completed in 50 minutes, then in how much time 60% of the reaction is completed [log 2 = 0.30, log 3 = 0.477, log 6 = 0.778, log 8 = 0.90]

Options:

	25 min
	100 min
	150 min
	200 min

Solution :

(4)

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Question : 7

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Slope of the graph between ln[A] vs time for 1^st order reaction is [where [A] = final concentration]

Options:

	k
	–k
	–ln[A0]

Solution :

(2)

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Question : 8

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Starting with 100 g of radioactive substance, how much of it is left after two half life?

Options:

	100 g
	50 g
	25 g
	Substance gets fully reacted

Solution :

(3)

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Question : 9

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For a first order reaction the correct graph shown between log   versus time

Options:

Solution :

(3)

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Question : 10

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For a zero order reaction, if 10% of the reactant is consumed in 10 minute, find half life period of reaction

Options:

	0.693 min
	50 min
	100 min
	693 min

Solution :

(2)

Zero order reaction