NTA is going to hold JEE Mains exam, Joint Entrance Exam (Mains), 2022. Physics, Mathematics, and Chemistry, all three subjects have equal weightage in JEE Mains 2022 exam. There are 75 questions from all three subjects, and for each subject, 100 marks are allotted.
NTA has released all the Jee Mains 2022 Important dates and announcements. And exam date is also near to reach. So it’s time for aspirants to summarise their preparations and peek at the quick revision notes of important topics.
One of these topics is Oxygen. Among the Chemistry section questions, you can easily spot 5-6 questions related to Oxygen. Whether in Physical Chemistry, Inorganic Chemistry, or Organic Chemistry, Oxygen plays an important role and shows its different properties and nature.
This article will help you with some important questions related to Oxygen from overall Chemistry.
| Table of Contents |
| Highlights About JEE mains 2022 |
| Topics of Chemistry Related To Oxygen Included In JEE Mains 2022 Exam |
| Expected Weightage Of Oxygen Related Topics In JEE Mains 2022 Exam |
| Some Important Questions On Oxygen For JEE Mains 2022 Exam |
| Conclusion |
| FAQs |
Oxygen, one of the most important elements of the Periodic Table, is an important part of every living organism. It is the Earth’s most abundant element after Hydrogen and Helium and the third most abundant element in the world.
It is expected for Oxygen related questions to weigh around 20-25 marks in JEE Mains 2022 Chemistry section. Let’s look and get to know more about topics and important questions related to Oxygen.
Highlights About JEE mains 2022
Joint Entrance Exam (JEE Mains) 2022 is a national-level entrance exam for B.E., B.Tech., B. Arch., and B. Planning courses. You can enrol in IITs, NITs, or any Centrally Funded engineering institutes. The main highlights of JEE Mains 2022 are as follows:
| Particulars | Details |
| Mode of examination |
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| Duration of examination |
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| Exam Frequency | Twice a year |
| Paper |
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| A number of questions |
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| Total marks for the exam |
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| Marking scheme |
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Topics Of Chemistry Related To Oxygen Included In JEE Mains 2022 Exam
The topic-wise distribution of Chemistry chapters’ that are related to Oxygen for JEE mains 2022 exam are as follows:
- Redox Reactions
Topics included are:
- Electronic concepts of oxidation and reduction
- Redox reactions
- Oxidation number
- Rules for assigning oxidation number
- Balancing of redox reactions
- Carboxylic Acids & their Derivatives
Topics included are:
- Acidic strength and factors affecting it
- Chemical Bonding
Topics included are:
- Covalent Bonding
- Concept of electronegativity
- Valence Shell Electron Pair Repulsion (VSEPR) theory
- Fajan’s rule
- Dipole moment
- Valence bond theory
- Concept of hybridization involving s, p, and d orbitals
- Alcohols, Phenols, and Ethers
Topics included are:
- Alcohols: Identification of primary, secondary, and tertiary alcohols;
mechanism of dehydration
- Phenols: Acidic nature, electrophilic substitution reactions: halogenation, nitration, and sulphonation, Reitner – Tiemann reaction
- Ethers: Structure
- Aldehydes and Ketones
Topics included are:
- Nature of carbonyl group
- Nucleophilic addition to >C=0 group
- Relative reactivities of aldehydes and ketones
- Nucleophilic addition reactions
- Grignard reagent
- Oxidation and Reduction
- Aldol condensation
- Cannizzaro reaction
- Haloform reaction
- p-Block Elements
Topics included are:
- Structures and uses of ozone
- Structures of oxoacids of sulphur
Expected Weightage of Oxygen Related Topics In JEE Mains 2022 Exam
Due to the vast syllabus of JEE Mains, it is hard to predict which topic will be given more importance every year. But, from the previous years’ papers, you can deduce some information about this and analyse it.
The expected weightage list of Oxygen related topics in JEE 2022 exam is as follows:
| Chapter | Weightage |
| Redox Reaction | 4 |
| Carboxylic Acids & their Derivatives | 4 |
| Chemical Bonding | 8 |
| Alcohols, Phenols, and Ethers | 4 |
| Aldehydes and Ketones | 4 |
| p-Block Elements | 4 |
Some Important Questions On Oxygen For JEE Mains 2022 Exam
Some important questions related to oxygen are as follows:
- Reaction of phenol with Br2 and H2O gives A and reaction of phenol with Br2 and CS2 at less than 5o C gives B. Find the product A and B.
Options:
- A = 1,5-dibromophenol, B = 1-bromophenol
- A = 1-bromophenol. B = 3-bromophenol
- A = 1,3,5-tribromophenol, B = 1-bromophenol
- A = 1,3,5-tribromophenol, B = 3-bromophenol
- S1: Methyl orange is a suitable indicator for titration of strong acid and weak base
S2: Phenolphthalein is not a suitable indicator for titration of acetic acid and NaOH
Options:
- Both S1 and S2 are correct
- S1 is correct, but S2 is incorrect
- S1 is incorrect, but S2 is correct
- Both S1 and S2 are
On heating novolac with formaldehyde, which of the following polymers will form?
Options:
- Melamine
- Resin
- Bakelite
- Polystyrene
Which of the following reagents gives yellow precipitate for the following sequence
(i) NaOH, (ii) dil. HNO3, (iii) AgNO3?
Options:
- 3-methylchlorobenzene
- 2-methylbromobenzene
- 3-methylbromobenzene
- 2-iodomethyl bromobenzene
Which of the following is the correct sequential method to convert benzene to 3-nitrobenzoic acid?
Options:
- (i) CH3Cl + FeCl3, (ii) Conc. H2SO4, HNO3 (iii) alkaline KMnO4
- (i) Conc. H2SO4, HNO3, (ii) CH3Cl + FeCl3 (iii) alkaline KMnO4
- (i) alkaline KMnO4, (ii) CH3Cl + FeCl3 (iii) conc. H2SO4, HNO3
- (i) alkaline KMnO4, (ii) conc. H2SO4, HNO3 (iii) CH3Cl + FeCl3
When the Zn strip is dipped in Cu(NO₃)₂
Options:
- Zn undergoes reduction
- Zn undergoes oxidation
- Cu undergoes reduction
- Cu undergoes oxidation
In which of the following compound oxidation states of oxygen is zero?
Options:
- HOCl
- HOF
- HOI
- HOBr
Which of the following compounds does not give oxygen when heated?
Options:
- HgO
- KMnO₄
- KClO₃
- (NH₄)₂Cr₂O₇
Which oxide is not acidic?
Options:
- SO₂
- CrO₃
- Cl₂O₇
- Fe₂O₃
Which of the following is the strongest acid?
Options:
- o-Fluorophenol
- o-Chlorophenol
- o-Iodophenol
- o-Bromophenol
Given : XNa2HAsO3 + YNaBrO3 + ZHCl → NaBr + H3AsO4 + NaCl
Options: The values of X, Y and Z in the above redox reaction are respectively :
(1) 2, 1, 3
(2) 3, 1, 6
(3) 2, 1, 2
(4) 3, 1, 4
Consider the following reaction:
Options: xMnO4–+ yC2O42- +zH+ → xMn2+ + 2yCO2+(z/2)H2O
The values of x, y and z in the reaction are respectively :-
(1) 5, 2 and 16
(2) 2, 5 and 8
(3) 2, 5 and 16
(4) 5, 2 and 8
H2SO3(aq) + Sn4+(aq) + H2O(l) → Sn2+(aq) + HSO4–(aq) + 3H+(aq)
Options: Which of the following statements is correct?
(1) H2SO3 is the reducing agent because it undergoes oxidation
(2) H2SO3 is the reducing agent because it undergoes reduction
(3) Sn4+ is the reducing agent because it undergoes oxidation
(4) Sn4+ is the oxidising agent because it undergoes oxidation
Which product is formed in the following reaction:
- Rank the following compounds in decreasing order of their reactivity for nitration:
Options:
- 4 > 2 > 1 > 3
- 4 > 2 > 3 > 1
- 2 > 4 > 1 > 3
- 1 > 2 > 3 > 4
Conclusion
Chemistry is fun to learn. It involves an in-depth study of the topics related to chemicals and their formation. The section is very scoring. You need to gain command over the concepts to score well.
It’s not hard to understand Oxygen’s properties, nature, and structure in Chemistry. It has various common uses in our day-to-day life. And the simplest is breathing. The JEE Mains exam contains a good weightage of Oxygen-related topics, making it more important to prepare for it.
We tried to pack up all relevant information about Oxygen for the JEE 2022 exam in this article. We hope these will be beneficial for you.
FAQs
1. What tips should I use to solve the problems of oxygen-containing organic compounds in the JEE 2022 exam?
You can follow the given below tips:
- Read the chapters carefully and understand the concepts and reactions mechanisms.
- Practice chemical reactions multiple times.
- Try to memorise the reaction mechanisms of Oxygen-containing name reactions.
- Do not leave any single text, graphic, diagram, table, or reaction from NCERT books.
- Try questions from within the chapters and those given at the end of the chapter.
- Solve sample papers, previous years’ papers and mock papers as much as possible.
2. What are the allotropic forms of Oxygen (O₂)?
- Oxygen has two allotropic forms, diatomic (O₂) and triatomic (O₃, ozone).
- Diatomic (O₂):
The properties of the diatomic form suggest that six electrons bond the atoms, and two electrons remain unpaired, accounting for the paramagnetism of Oxygen.
- Triatomic (O₃):
The three atoms in the ozone molecule do not lie along a straight line. Oxygen may produce ozone according to the equation:
3. What is Esterification?
Esters are formed when alcohols and phenols react with carboxylic acids, chlorides, and anhydrides.
Esters are formed when alcohols and phenols react with carboxylic acids, acid chlorides, and acid anhydrides.
The reaction takes place in the presence of a small amount of concentrated sulphuric acid in the case of carboxylic acid and acid anhydride. The reaction is reversible, and therefore water is removed as soon as it is formed.
4. What are the elementary properties of Oxygen that make it an important element in Chemistry?
Oxygen is a colourless, odourless, tasteless gas essential to living organisms. Plants utilise carbon dioxide as a carbon source and return Oxygen to the atmosphere.
Oxygen forms compounds by reaction with practically any other element and by reactions that displace elements from their combinations with each other. Some elementary properties of Oxygen are:
| Atomic Number | 8 |
| Atomic Weight | 15.9994 |
| Melting Point | −218.4 °C (−361.1 °F) |
| Boiling Point | −183.0 °C (−297.4 °F) |
| Density | 1.429 g/litre |
| Oxidation State | −1, −2, +2 (in compounds with fluorine) |
| Electronic Configuration | 1s2 2s2 2p4 |
5. How can we differentiate Aldehydes and Ketones?
We can differentiate Aldehydes and Ketones by the following tests:
- Fehling’s Test:
Fehling’s Solution A (CuSO₄ aqueous solution) + Fehling’s Solution B (alkaline sodium potassium tartrate) is Fehling’s Reagent. It is used to perform this test.
A reddish-brown cuprous oxide precipitate is formed when an aldehyde is heated with Fehling’s reagent.
Ketones do not produce such precipitate.
- Tollen’s Test:
Tollen’s test produces a silver mirror when an aldehyde is treated with Tollen’s reagent. An ammoniacal solution of AgNO₃ is Tollen’s reagent.
Ketones do not produce any silver mirror.
