Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2018
Exam
NEET
Year
2018
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2018 · Chemistry · Chemical Kinetics

What is the correct difference between first and second order...

What is the correct difference between first and second order reactions?

Options

  1. AA first-order reaction can be catalyzed; a second-order reaction cannot be catalyzed.
  2. BThe half-life of a first-order reaction does not depend on [A]0{\left[A\right]}_{0}; the half-life of a second-order reaction does depend on [A]0{\left[A\right]}_{0}.
  3. CThe rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations.
  4. DThe rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations.

Correct answer

B. The half-life of a first-order reaction does not depend on [A]0{\left[A\right]}_{0}; the half-life of a second-order reaction does depend on [A]0{\left[A\right]}_{0}.

Step-by-step solution

⇒ ( t\dfrac{1}{2} ) ∝ {( \text{Initial concentration} )}^{1 - \text{orderofofReaction}}\left(t\dfrac{1}{2}\right)\text{for}{1}^{st}order=IndependentofConcentration<br/><br/>(t12)for2ndorder = Independent of Concentration<br /><br />\left(t\dfrac{1}{2}\right)\text{for}{2}^{nd} order ∝1[A]0∝ \dfrac{1}{{\left[A\right]}_{0}}

⇒⇒ Rate of first order reaction ∝(A0)1∝ {( {A}_{0} )}^{1}

Rate of second order reaction ∝(A0)2∝ {( {A}_{0} )}^{2} rate of first order reaction and second order reaction depends on initial concentration.
Practice Chemical Kinetics on Quantrex Academy →

More from Chemical Kinetics

The combination of NO_2(g) and CO(g) occurs in two steps as follows: What is the rate law… MHT CET Medical 2026The slope of the graph [A]_t against time for zero order reaction is MHT CET Medical 2026For the reaction C_2H_5Br_ (l) arrow C_2H_ 4(g) + HBr , r = K(C_2H_5Br) What is order and… MHT CET Medical 2026The decomposition of N_2O_ 5(g) occurs as: 2\ N_2O_ 5(g) arrow 4\ NO_ 2(g) + O_ 2(g) . If… MHT CET Medical 2026Which of the following statements represents rate of reaction? MHT CET Medical 2026What is the order of reaction for the following? 2H_2O_2(l) arrow 2H_2O(l) + O_2(g) MHT CET Medical 20262A k B is a zero-order reaction, where k=1.0 mol L ^ -1 min ^ -1 . If the initial… NEET 2026Match List I with List II : List I (Order of reaction) List II (Unit of rate constant) A.… NEET 2026 Full Chemical Kinetics list All NEET PYQs