Chemistry XII+ - Chemical Kinetics 01

Question : 1

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In a gaseous reaction, the units of rate of reaction will be

Options:

	mol L–1 s–1
	atm s–1
	Both (1) & (2)
	It depends upon reaction

Solution :

(2)

Fact

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Question : 2

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For the rate constant of a reaction, which is incorrect?

Options:

	Positive catalyst increases value of rate constant
	Rate constant of elementary always increases on increasing temperature
	Rate constant becomes higher, when the initial concentration of reactant is increased
	K remains constant throughout the progress of reaction at constant temperature

Solution :

(3)

K is independent of initial concentration.

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Question : 3

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For the reaction

5Br⁻  BrO₃⁻  6H  3Br₂  3H₂O

Which of the following is correct?

Options:

	Rate of appearance of Br2 is half than the rate of disappearance of H+
	Rate of disappearance of  BrO3−  is one-sixth of the rate of disappearance of H
	Rate of disappearance of H+ is double than rate of appearance of H2O
	All of these

Solution :

(4)

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Question : 4

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For the reaction,
2A (g) → 3B (g) + 2C (g)
If rate of appearance of B is 0.03 mol/L/s, then the rate of the above reaction is

Options:

	0.01 mol/L/s
	0.03 mol/L/s
	0.09 mol/L/s
	0.11 mol/L/s

Solution :

(1)

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Question : 5

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For the reaction,
2SO₂ + O₂ → 2SO₃
If rate of disappearance for SO₂ is 8 gm/L/s, then the rate of appearance for SO₃ will be

Options:

	8 gm/L/s
	10 gm/L/s

Solution :

(3)

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Question : 6

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The rate of reaction in terms of formation of product for first order reaction is indicated correctly by

Options:

	Both (1) & (2)

Solution :

(2)

Rate of formation of product.

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Question : 7

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For reaction A → B
If change in concentration of B is 0.005 mol/L in 50 seconds, then the rate of chemical reaction is given by

Options:

	10–4 mol/L/min
	0.005 mol/L/min
	6.0 × 10–3 mol/L/min
	6.0 × 10–4 mol/L/min

Solution :

(3)

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Question : 8

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Which of the following is a very fast reaction?

Options:

	Rusting of iron
	Hydrolysis of starch
	Inversion of cane sugar
	AgNO3 + NaCl

Solution :

(4)

Fact

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Question : 9

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Which is true regarding law of mass action for the reaction 2A + B → Product?

Options:

	Rate ∝ [A]2 [B]1
	Rate ∝ [A]1 [B]2
	Rate ∝ [A]1 [B]1
	All of the these possible

Solution :

(1)

Rate ∝ [A]² [B]¹

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Question : 10

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For the reaction
2NO + Br₂ → 2NOBr
The rate of formation of NOBr will be equal to that of

Options:

	Rate of disappearance of NO
	Rate of disappearance of Br2
	One-fourth of rate of disappearance of NO
	One-fourth of rate of disappearance of Br2

Solution :

(1)

Rate of disappearance of NO.