Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Consider the reactions and their rate expressions given below Reaction 1:  <img alt="\mathrm{H_2 + Cl_2\longrightarrow 2 HCl, \ Rate = k_1 [H]^0[Cl]^0}" src="https://entran

Consider the reactions and their rate expressions given below

Reaction 1: 

\mathrm{H_2 + Cl_2\longrightarrow 2 HCl, \ Rate = k_1 [H]^0[Cl]^0}

Reaction 2:

\mathrm{H_2 + Br_2\longrightarrow 2 HBr, \ Rate = \frac{k_{2}\left[H_{2}\right]^{1} \cdot\left[B r_{2}\right]^{1 / 2}}{1+k_{3}[H B r] /\left[B r_{2}\right]}}

Reaction 3: 

\mathrm{H_2 + I_2\longrightarrow 2 HI, \ Rate = k_4[H_2][I_2]}

Which of these reactions are expected to be elementary?

Option: 1

Reactions (1) and (2) only


Option: 2

Reaction (2) and (3) only


Option: 3

Reactions (1) and (3) only


Option: 4

Reaction (3) only


Answers (1)

best_answer

An elementary reaction is a reaction that occurs in a single step. The rate law for an elementary reaction can be derived from the coefficients of the reactants in the balanced equation.

Zero-order reactions are never elementary

Also, the reaction of formation of HBr is a complex reaction as shown by the rate expression

The reaction (3) of formation HI can be elementary and the reaction can complete in a single step.

Hence, the correct option is (4)

Posted by

Sanket Gandhi

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2025 response sheet errors: Delhi HC allows student to apply for JEE Adv, seeks NTA explanation
anam-khan

Four Kashmiri girls defy the odds, score 99+ percentile in JEE Main 2025
anam-khan

JEE, NEET, CUET coaching centres: Assam, Rajasthan have framed laws, but will they work?

Latest Question