NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 15

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12th West Bengal Board

IMPORTANT

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When temperature is raised, the rate of reaction increases because of

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Important Questions on Chemical Kinetics

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12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 16

The half-life period of a first order reaction is

100 \sec .

The rate constant of the reaction is

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 17

Which is the correct expression for the rate of reaction for the reaction

2 A ⟶ B

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 18

The rate constant for the reaction :

2 N_{2} O_{5} ⟶ 4 {NO}_{2} + O_{2}

is

3.0 \times 10^{- 5} \sec^{- 1} .

If the rate is

2.40 \times 10^{- 5} mol {litre}^{- 1} \sec^{- 1},

then the concentration of

N_{2} O_{5}

(in

mol {litre}^{- 1}

) is

HARD

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 19

For a reaction,

2 {NO}_{(g)} + {Cl}_{2 (g)} ⇌ 2 {NOCl}_{(g)}

When concentration of

{Cl}_{2}

is doubled, the rate of reaction becomes two-times of the original. When the concentration of

NO

is doubled the rate becomes four times. What is the order of the reaction ?

MEDIUM

12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 20

For the reaction $N_{2} + 3 H_{2} ⟶ 2 {NH}_{3}, \frac{- Δ [{NH}_{3}]}{Δt} = 2 \times 10^{- 4} mol {lit}^{-} \sec^{- 1} .$

The value of $\frac{- Δ [H_{2}]}{Δt}$ would be:

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12th West Bengal Board

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NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 21

If

' I'

is the intensity of absorbed light and

' C'

is concentration of

AB

for photochemical process

AB + hv ⟶ AB *,

the rate of formation of

AB *

is directly proportional to

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12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 22

For the reaction

H_{2} (g) + {Br}_{2} ⇌ 2 HBr (g)

the reaction rate

= k [H_{2}] {[{Br}_{2}]}^{1 / 2} .

Which one of the following statements is true about this reaction?

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12th West Bengal Board

IMPORTANT

NEW SYSTEMATIC MODERN CHEMISTRY>Chapter 4 - Chemical Kinetics>REVIEW EXERCISES>Q 23

The role of a catalyst is to change the: