First Order Reactions and Half-life Practice Questions

Integrated Rate Equations - First Order Reactions and Half-life

For the reaction A + 3B → 2C, the rate of disappearance of A is 0.02 mol L⁻¹ min⁻¹. What is the rate of formation of C?

Δ[C]/Δt = 2 × 0.02 = 0.04 mol L⁻¹ min⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.04 L mol⁻¹ min⁻¹ and an initial concentration of 0.25 mol L⁻¹. What is

t½ = 1/(0.04×0.25) = 100 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.04 L mol⁻¹ s⁻¹. If the initial concentration is 0.25 mol L⁻¹, what is t

t½ = 1/(0.04×0.25) = 100 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.03 L mol⁻¹ s⁻¹ and an initial concentration of 0.25 mol L⁻¹. What is th

t½ = 1/(0.03×0.25) ≈ 133.33 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.04 L mol⁻¹ s⁻¹ and an initial concentration of 0.2 mol L⁻¹. What is the

t½ = 1/(0.04×0.2) = 125 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

The half-life of a second-order reaction is 25 s when the initial concentration is 0.4 mol L⁻¹. What is the rate constan

k = 1/(25×0.4) = 0.1 L mol⁻¹ s⁻¹.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A first-order reaction has a rate constant of 0.0139 min⁻¹. What is the half-life?

t½ = 0.693/0.0139 ≈ 50 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.02 L mol⁻¹ min⁻¹ and an initial concentration of 0.4 mol L⁻¹. What is t

t½ = 1/(0.02×0.4) = 125 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A zero-order reaction has an initial concentration of 0.24 mol L⁻¹ and a rate constant of 3.0 × 10⁻³ mol L⁻¹ s⁻¹. What i

t½ = 0.24/(2×3.0×10⁻³) = 40 s.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A second-order reaction has a rate constant of 0.03 L mol⁻¹ min⁻¹ and an initial concentration of 0.15 mol L⁻¹. What is

t½ = 1/(0.03×0.15) ≈ 222.22 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

The rate of a reaction is Rate = k[A]⁰.⁵[B]⁰.⁵. What is the overall order?

Overall order = 0.5 + 0.5 = 1.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

A first-order reaction has a rate constant of 0.0346 min⁻¹. What is the half-life?

t½ = 0.693/0.0346 ≈ 20 min.

Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Integrated Rate Equations - First Order Reactions and Half-life

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Integrated Rate Equations - First Order Reactions and Half-life

No questions in this category

For the reaction A + 3B → 2C, the rate of disappearance of A is 0.02 mol L⁻¹ min⁻¹. What is the rate of formation of C?

A second-order reaction has a rate constant of 0.04 L mol⁻¹ min⁻¹ and an initial concentration of 0.25 mol L⁻¹. What is

A second-order reaction has a rate constant of 0.04 L mol⁻¹ s⁻¹. If the initial concentration is 0.25 mol L⁻¹, what is t

A second-order reaction has a rate constant of 0.03 L mol⁻¹ s⁻¹ and an initial concentration of 0.25 mol L⁻¹. What is th

A second-order reaction has a rate constant of 0.04 L mol⁻¹ s⁻¹ and an initial concentration of 0.2 mol L⁻¹. What is the

The half-life of a second-order reaction is 25 s when the initial concentration is 0.4 mol L⁻¹. What is the rate constan

A first-order reaction has a rate constant of 0.0139 min⁻¹. What is the half-life?

A second-order reaction has a rate constant of 0.02 L mol⁻¹ min⁻¹ and an initial concentration of 0.4 mol L⁻¹. What is t

A zero-order reaction has an initial concentration of 0.24 mol L⁻¹ and a rate constant of 3.0 × 10⁻³ mol L⁻¹ s⁻¹. What i

A second-order reaction has a rate constant of 0.03 L mol⁻¹ min⁻¹ and an initial concentration of 0.15 mol L⁻¹. What is

The rate of a reaction is Rate = k[A]⁰.⁵[B]⁰.⁵. What is the overall order?

A first-order reaction has a rate constant of 0.0346 min⁻¹. What is the half-life?

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