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#reaction rate

63 public questions tagged with this topic.

CHEMISTRY

A gaseous reaction follows Rate = k p_A² . If k = 0.1 atm^{-1 s^{-1 and p_A = 0.4 atm, what is the rate in atm s^{-1 ?

Given: A gaseous reaction follows Rate = k p_A² . If k = 0.1 atm^{-1 s^{-1 and p_A = 0.4 atm, what is the rate in atm s^{-1 ? These values define the system as per NCERT data. Formula: Rate = k p_A² = 0.1 × (0.4)² = 0.1 × 0.16 = 0.016 .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

The initial rate of a reaction is 2.0 × 10⁻³ mol L^{-1 s^{-1 when [A] = 0.5 M and [B] = 0.2 M. If the rate law is Ra

Given: The initial rate of a reaction is 2.0 × 10⁻³ mol L^{-1 s^{-1 when [A] = 0.5 M and [B] = 0.2 M. If the rate law is Rate = k[A][B], what is k in L mol^{-1 s^{-1 ? These values define the system as per NCERT data. Formula: k = fracRate[A][B] = frac2.0 × 10⁻³⁰.5 × 0.2 = 0.02 .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

A first-order reaction has a rate constant of 0.01386 min^{-1 . What percentage of the reactant remains after 100 minute

Given: A first-order reaction has a rate constant of 0.01386 min^{-1 . What percentage of the reactant remains after 100 minutes? These values define the system as per NCERT data. Formula: ln frac[R]_0[R] = k t = 0.01386 × 100 = 1.386. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: frac[R][R]_0 = e^{-1.386 = 0.25, so 25% remains. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

For the reaction 2A + 3B -> C, the concentration of A decreases from 0.14 M to 0.10 M in 20 seconds. What is the average

Given: For the reaction 2A + 3B -> C, the concentration of A decreases from 0.14 M to 0.10 M in 20 seconds. What is the average rate of formation of C in mol L^{-1 s^{-1 ? These values define the system as per NCERT data. Formula: Rate = -1/2 fracΔ[A]Δ t = -1/3 fracΔ[B]Δ t = fracΔ[C]Δ t. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Δ[A] = 0.10 - 0.14 = -0.04 mol L^{-1, Δ t = 20 s . -fracΔ[A]Δ t = 2.0 × 10⁻³, so fracΔ[C]Δ t = frac2.0 × 10⁻³²= 1.0 × 10⁻³. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

A zero-order reaction has a rate constant of 7.0 × 10⁻³ mol L^{-1 s^{-1 . What is the half-life if the initial conce

Given: A zero-order reaction has a rate constant of 7.0 × 10⁻³ mol L^{-1 s^{-1 . What is the half-life if the initial concentration is 0.28 M? These values define the system as per NCERT data. Formula: For zero order, t_{1/2 = frac[R]_02k = frac0.282 × 7.0 × 10⁻³= 20 s .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

A reaction has the rate law Rate = k[A][B]⁰ . If [A] is increased by a factor of 4, what happens to the rate?

Given: A reaction has the rate law Rate = k[A][B]⁰ . If [A] is increased by a factor of 4, what happens to the rate? Formula: Rate = k[A], new rate = k(4[A]) = 4k[A]. Substitution & Calculation: Rate increases by a factor of 4. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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