Download App

Redox Reactions — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryRedox Reactions3 Marks
Question
Consider the reactions:

O3(g) + H2O2(l) → H2O(l) + 2O2(g)

Why it is more appropriate to write these reactions as:

O3(g) + H2O2(l) → H2O(l) + O2(g) + O2(g)

Also suggest a technique to investigate the path of the above redox reactions.

✓

Answer

O2 is produced from each of the two reactants O3 and H2O2. For this reason, O2 is written twice.

The given reaction involves two steps. First, O3 decomposes to form O2 and O. In the second step, H2O2 reacts with the O produced in the first step, thereby producing H2O and O2.

$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}_{3(\text{g})}\xrightarrow{\ \ \ \ \ \ \ \ }\text{O}_{2(\text{g})}+\text{O}_{(\text{g})}\\ \ \ \ \text{H}_2\text{O}_{2(\text{l})}+\text{O}_{(\text{g})}\xrightarrow{\ \ \ \ \ \ \ \ }\text{H}_2\text{O}_{(\text{l})}+\text{O}_{2(\text{g})}\\\overline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }\\\text{H}_2\text{O}_{2(\text{l})}+\text{O}_{3(\text{g})}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{H}_2\text{O}_{(\text{l})}+\text{O}_{2(\text{g})}+\text{O}_{2(\text{g})}$

The path of this reaction can be investigated by using $\text{H}_2\text{O}_2^{18}$ or $\text{O}_3^{18}.$

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 Redox Reactions→Redox Reactions — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

(i) Write the electronic configurations of the following ions : (a) $H ^{-}$(b) $Na ^{+}$(c) $O ^{2-}$ (d) $F ^{-}$
(ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) $3 s^1$ (b) $2 p^3$ and (c) $3 p^5$ ?
(iii) Which atoms are indicated by the following configurations?
(a) $[ He ] 2 s^1$
(b) $[ Ne ] 3 s^2 3 p ^3$
(c) $[ Ar ] 4 s^2 3 d^1$.
→
  1. Determine group and block of elements with atomic number 29 and 35.
  2. Define $\pi$ bonds.
→
  1. A compound contains 21.6% sodium, 33.3% chlorine, 45.1 % oxygen. Derive its empirical formula.
  2. Write the empirical formulae for the following compounds:
  • H2O
  • B2H6
  1. State the number of significant figures in each of the following numbers:
  • 638
  • 0.000315
→
Calculate $\Delta_\text{f}\text{H}^\circ$ of HCl if bond energy of H-H bond is 437kJ mol-1, Cl-Cl bond is 244kJ mol-1 and H-Cl is 433kJ mol-1.
→
The bromine atom possesses 35 electrons. It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electron in 4p orbital. Which of these electron experiences the lowest effective nuclear charge?
→
A liquid is in equilibrium with its vapour in a sealed container at a fixed temperature. The volume of the container is suddenly increased.
(a) What is the initial effect of the change on vapour pressure?
(b) How do rates of evaporation and condensation change initially?
(c) What happens when equilibrium is restored finally and what will be the final vapour pressure?
→
How does Cu2O act as both oxidant and reductant? Explain with proper reactions showing the change of oxidation numbers in each example.
→
Which of the species have same bond order and paramagnetic? Give reason.

$\text{N}_2,\text{F}^+_2,\text{N}^-_2,\text{O}^-_2$

→
Can an element with atomic number 126, if discovered, be accommodated in the present Un set up of the long form of periodic table?
→
  1. What is the shape of orbital with l = 2 and l = 3?
  2. Account for the following:
  • Chromium has configuration 3d5 4s1 and not 3d4 4s2.
  • Bohr's orbits are called stationary orbits or states.
→