Download App

Chemical Kinetics — Chemistry STD 12 Science — Question

Gujarat 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 = $K[H_2O_2]^1 [I^-]^1$
Order of reaction w.r.t.$H_2O_2 = 1$.
  1. 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→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

  1. Urea forms an ideal solution in water. Determine the vapour pressure of anaqueous solution containing 10% by mass of urea at 40°C. (Vapour pressure of water at 40°C = 55.3 mm of Hg)
  2. Why is freezing point depression of 0.1 M sodium chloride solution nearly twice that of 0.1 M glucose solution?
→
The decomposition of A into product has value of k as $4.5 \times 10^3 s^{-1}$ at $10^{\circ} C$ and energy of activation $60 kJ mol ^{-1}$. At what temperature would k be $1.5 \times 10^4 s^{-1}$ ?
→
Write IUPAC names of the following coordination compounds:
i. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$
ii. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right) 5 \mathrm{Cl}^2 \mathrm{Cl}_2\right.$
iii. $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
→
What are haloarenes? How are they classified? Give one method for each of the preparation of nuclear and side chain substituted halorenes.
→
How can you convert?
  1. Toluene to Benzaldehyde.
  2. Ethanoic acid to 2-chloroethanoic acid.
  3. Acetone to Propane.
→
Explain vapour pressure of solutions of solids in liquids.
→
Define the following terms:
  1. Glycosidic linkage.
  2. Invert sugar.
  3. Oligosaccharides.
→

Give the IUPAC name of the following organic compounds:
  1. $\text{(CH}_3)_2\text{C}=\text{CH}-\text{C}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ||\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}$
  2.  
  1. $\text{CH}_3\text{CH}\text{(Br)}\text{CH}_2\text{CONHCH}_3$
→
What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.
→
For the reaction:
$2 A+B \rightarrow A_2 B$
the rate $= k [ A ][ B ]^2$ with $k =2.0 \times 10^{-6} mol^{-2} L^2 s^{-1}$. Calculate the initial rate of the reaction when $[ A ]=0.1 mol$ $L ^{-1},[B]=0.2 mol L ^{-1}$. Calculate the rate of reaction after $[ A ]$ is reduced to $0.06 mol L ^{-1}$.
→