Download App

Chemical Kinetics — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryChemical Kinetics3 Marks
Question
Consider the decomposition of hydrogen peroxide in alkaline medium which is catalysed by iodide ions.
$\text{2H}_2\text{O}_2\xrightarrow{\text{OH}^-}2\text{H}_2\text{O}+\text{O}_2$
This reaction takes place in two step as given below:
Step-I $\text{H}_2\text{O}_2+\text{I}^-\rightarrow\text{H}_2\text{O}_2+\text{IO}^-\text{ (slow)}$
Step-II $\text{H}_2\text{O}_2+\text{IO}^-\rightarrow\text{H}_2\text{O}_2+\text{I}+\text{O}_2\text{ (fast})$
  1. Write the rate law expression and determine the order of reaction $w.r.t. H_2O_2.$
  2. What is the molecularity of each individual step?
✓

Answer

  1. Rate $= K[H_2O_2]^1 [I^-]^1$
  1. Order of reaction $w.r.t.H_2O_2 = 1.$
  2. Molecularity of step $I = 2$ amd step $II = 2.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Chemical Kinetics→Chemical Kinetics — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

The following data were obtained during the first order thermal decomposition of $SO_2Cl_2$ at a constant volume:
$\ce{SO_2Cl_2(g) \rightarrow SO_2(g) + Cl_2(g)}$
Experiment
Time/s$^{–1}$
Total pressure/atm
$1$ $0$ $0.4$
$2$ $100$ $0.7$
Calculate the rate constant.
$($Given: $\ce{log4 = 0.6021, log2 = 0.3010).}$
→
A graph between ln $k$ and $\frac{1}{\text{t}}$ for a reaction is given. Here $k$ is rate constant and $T$ is temperature in Kelvin.If $OA = a$ and $OB = b,$ answer the following:
  1. What is the activation energy $(Ea)$ of the reaction?
  2. What is the frequency factor $(A)$ for the reaction?
→
For a reaction $2 H _2 O _2 \frac{ I ^{-}}{\text {alkaline medium }} 2 H _2 O + O _2$
the proposed mechanism is as given below:
(1) $H_{2}O_{2}+I^{-}\rightarrow H_{2}O+IO^{-}$ (slow)
(2) $H_{2}O_{2}+IO^{-}\rightarrow H_{2}O+I^{-}+O_{2}$ (fast)
(i) Write rate law for the reaction.
(ii) Write the overall order of reaction.
(iii) Out of steps (1) and (2), which one is rate determining step?
→
An antifreeze solution is prepared from 222.6 g of thylene glycol (C2H6O2) and 200 g of water. Calculate the molality of the solution. If the density of the solution is $1.072 g mL ^{-1}$ , then what shall be the molarity of the solution?
→
How do you convert the following:
  1. Prop-1-ene to Propan-2-ol
  2. Bromobenzene to 2-bromoacetophenone
  3. 2-bromobutane to But-2-ene
→
$\text{E}^\ominus V$ of $Cu$ is $+ 0.34V$ while that of $Zn$ is $– 0.76V.$ Explain.
→
Explain optical isomerism in co$-$ordination compound.
→
What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.
→
  1. Explain why an alkylamine is more basic than ammonia.
  2. How would you convert:
  1. Aniline to nitrobenzene.
  2. Aniline to iodobenzene?
→
Write the mechanism of hydration of ethene to yield ethanol.
→