Hydrogen Chapter of JEE Main 2026 holds a weightage of 2.5% in the exam. Some of the important Hydrogen JEE Main Questions 2026 have been provided here along with their solutions. Practice these questions to succeed in the exam.
Hydrogen is one of the significant topics of the JEE Main 2026 Chemistry Syllabus, as it contributes 2.5% of the total chemistry weightage. The JEE Main 2026 aspirants should be aware of the important Hydrogen JEE Main 2026 questions and practice them to score well in the examination. The Hydrogen section of the
JEE Main 2026 Chemistry Syllabus
is a crucial chapter and it deals with the elemental properties and significance of hydrogen. Candidates can find 1 question from the Hydrogen chapter in the
JEE Main 2026
exam. Hence, candidates must habituate themselves with the important practice questions of the Hydrogen chapter for JEE Main 2026. JEE Main 2026 is scheduled to be conducted from January 21 to 30 for Session 1. So, you can start practising the previous years' questions to improve your preparation.
Candidates are advised to read this article thoroughly for the JEE Main Hydrogen questions along with their solutions.
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JEE Main 2026 Hydrogen Important Questions
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Candidates can check the practice questions for JEE Main Hydrogen 2026 along with their solutions as provided in the table below.
Serial No. | Question | Solution |
|---|---|---|
1. | Which one of the following statements about water is false? (1) Water is oxidized to oxygen during photosynthesis. (2) Water can act both as an acid and as a base. (3) There is extensive intramolecular hydrogen bonding in the condensed phase. (4) Ice formed by heavy water sinks in normal water. | There is extensive intermolecular hydrogen bonding in water molecules in the condensed phase. It is not intramolecular hydrogen bonding. Hence option (3) is the correct answer. |
2. | NaH is an example of (1) metallic hydride (2) saline hydride (3) electron-rich hydride (4) molecular hydride. | NaH is an example of saline hydride. Hydrides are binary compounds of the elements with hydrogen. Hence option (2) is the answer. |
3. | The chemical nature of hydrogen peroxide is (1) oxidising and reducing agent in both acidic and basic medium (2) oxidising agent in acidic medium, but not in basic medium (3) oxidising and reducing agent in acidic medium, but not in basic medium (4) reducing agent in basic medium, but not in acidic medium. | Hydrogen peroxide acts as both oxidising and reducing agent in both acidic and basic medium. Hence option (1) is the answer. |
4. | The isotopes of hydrogen are (1) protium, deuterium and tritium (2) protium and deuterium only (3) deuterium and tritium only (4) tritium and protium only. | The isotopes of hydrogen are protium, deuterium and tritium. Hence option (1) is the answer. |
5. | Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases does H2O2 act as a reducing agent in acid medium? (1) MnO4– (2) SO32- (3) KI (4) Cr2O72- | Reducing agent is an element or compound that loses or donates an electron to an electron recipient, oxidizing agent in a redox chemical reaction. H2O2 + MnO4– → Mn+2 +O2 Hence option (1) is the answer. |
6. | Identify the incorrect statement regarding heavy water. (1) It reacts with SO3 to form deuterated sulphuric acid (D2SO4). (2) It is used as a coolant in nuclear reactors. (3) It reacts with CaC2 to produce C2D2 and Ca(OD)2. (4) It reacts with Al4C3 to produce CD4 and Al(OD)3. | Heavy water is used as a moderator in nuclear reactors to control the speed of neutrons. It is not used as a coolant. Hence option (2) is the correct answer. |
7. | The synonym for water gas, when used in the production of methanol, is (1) fuel gas (2) natural gas (3) laughing gas (4) syn gas. | Water-gas is CO+H2. It is used for the synthesis of methanol. So it is called syn gas. Hence option (4) is the answer. |
8. | Which physical property of dihydrogen is wrong? (1) Colourless gas (2) Odourless gas (3) Tasteless gas (4) Non-inflammable gas | Dihydrogen is an inflammable gas. Hence option (4) is the correct answer. |
9. | Which one of the following processes will produce hard water? (1) Saturation of water with CaCO3 (2) Saturation of water with MgCO3 (3) Saturation of water with CaSO4 (4) Addition of Na2SO4 to water | Hard water contains calcium and Magnesium salt in the form of hydrogen carbonate, chloride and sulphate. Permanent hardness is introduced when water passes over rocks containing the sulphates or chlorides of both calcium and magnesium. Hence option (3) is the correct answer. |
10. | In the preparation of sodium peroxoborate, H2O2 is treated with sodium metaborate. (1) 1,2,4 (2) 2,3,4 (3) 1,2,3,4 (4) 1,2,3 | All the given statements are correct. Hence option (3) is the answer. |
11. | Which of the following processes can make very pure hydrogen (99.9%)? (1) Reaction of salt like hydrides with water (2) Reaction of methane with steam (3) Mixing natural hydrocarbons of high molecular weight (4) Electrolysis of water | Very pure hydrogen (99.9%) can be made by electrolysis of water using platinum electrodes in presence of small amount of acid or alkali. 2H2O(l) → 2H2(g) + O2 Hence option (4) is the answer. |
12. | Determine the total number of neutrons in three isotopes of hydrogen (1) 1 (2) 2 (3) 3 (4) 4 | Number of neutrons = 0+1+2 = 3 Hence option (3) is the answer. |
13. | The correct statements among (A) to (D) regarding H2 as a fuel are (A) It produces less pollutants than petrol. (B) A cylinder of compressed dihydrogen weighs ~30 times more than a petrol tank producing the same amount of energy. (C) Dihydrogen is stored in tanks of metal alloys like NaNi5. (D) On combustion, values of energy released per gram of liquid dihydrogen and LPG are 50 and 142 kJ, respectively. (1) (A), (B) and (C) only (2) (B), (C) and (D) only (3) (A) and (C) only (4) (B) and (D) only | On combustion, the value of energy released per gram of liquid dihydrogen is 142kJ. The energy released per gram of LPG is 50kJ. Statement D is wrong. Hence option (1) is the answer. |
14. | Hydrogen peroxide oxidises [Fe(CN)6]4- to [Fe(CN)6]3- in acidic medium but reduces [Fe(CN)6]3- to [Fe(CN)6]4- in alkaline medium. The other products formed are, respectively : (1) (H2O + O2 ) and (H2O + OH–) (2) H2O and (H2O + O2) (3) H2O and (H2O + OH– ) (4) (H2O + O2 ) and H2O | [Fe(CN)6]4- reacts with hydrogen peroxide in acidic medium to form [Fe(CN)6]3- and water. [Fe(CN)6]4- + H2O2 + 2H+ → [Fe(CN)6]3-+ 2H2O [Fe(CN)6]3- reacts with hydrogen peroxide in alkaline medium to form [Fe(CN)6]4-, oxygen and water. [Fe(CN)6]3- + H2O2 + 2OH– → [Fe(CN)6]4-+O2+ 2H2O Hence option (2) is the answer. |
15. |
The metal that gives hydrogen gas upon treatment with both acid, as well as base, is
(2) zinc (3) mercury (4) iron. | Zinc is the metal that gives hydrogen gas upon treatment with both bases as well as an acid. Hence option (2) is the correct answer. |
16. | Which of the following statements are correct? (1) On decomposition of H2O2, O2 gas is released. (2) 2-ethylanthraquinol is used in the preparation of H2O2 (3) On heating KClO3, Pb(NO3)2, NaNO3, O2 gas is released. (4) In the preparation of sodium peroxoborate, H2O2 is treated with sodium metaborate. (1) 1,2,4 (2) 2,3,4 (3) 1,2,3,4 (4) 1,2,3 | All the given statements are correct. Hence option (3) is the answer. |
JEE Main 2026 Preparatory Articles
We hope this article has helped the candidates become aware of the important Hydrogen JEE Main Questions 2026. You can just fill out the Common Application Form on our website, it is a single application form for securing admission into various universities. For more articles and updates on JEE Main 2026, stay tuned with CollegeDekho.
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FAQs
Yes, Hydrogen chapter is important for the JEE Main 2026 exam. Candidates should study the essential concepts, formulas, and key points, to better their preparations before the JEE Main 2026 exam.
Mathematics is often considered to be the most challenging subject in the JEE Main exam, but its difficulty level varies from person to person. Some students may find other subjects more challenging based upon their strengths and weaknesses.
In the JEE Main Chemistry section, the questions asked are generally straightforward and the difficulty level is relatively lower. With the correct preparation approach in place, candidates can easily score 80+ in the JEE Mains Chemistry section.
Chemistry is considered to be the rank decider for the majority of candidates in any engineering entrance examination because it mostly deals with the basics and. In comparison to the Mathematics and Physics questions asked in the JEE Main exam, Chemistry questions are more theoretical than calculative, making it relatively easier for candidates to secure good marks.
NCERT books are very important to prepare for the JEE Main 2026 exam. The JEE Main exam follows the CBSE syllabus for 11th and 12th classes, so NCERT books are considered to be the most reliable and necessary study materials. NCERT books explain basic fundamental concepts simply and clearly.
To score a 99+ percentile in the JEE Main 2026 exam, candidates require more than just knowing the JEE Main syllabus, as it requires consistent practice, strategic revision, time management, and the ability to solve complex problems under pressure. However, with the appropriate resources, one can achieve these requirements.
All sections namely Mathematics, Physics, and Chemistry are mandatory in the JEE Main exam, with questions covering the entire JEE Main syllabus. To be eligible for admission, candidates must achieve the minimum qualifying marks in each subject and the overall aggregate.
Candidates can study from the NCERT textbooks of class 11 and 12 Physics, Chemistry and Mathematics to cover the JEE Mains syllabus. No changes have been made to the JEE Main Syllabus 2026. NTA removed several topics of Physics, Chemistry and Mathematics last year from the JEE Main syllabus.
Candidates must keep in mind that there is no requirement of 75% marks in class 12 for appearing in the JEE Mains exam. The JEE Main eligibility criteria of minimum 75% marks in class 12 is required at the time of securing admission across NITs, IIITs and GFTIs. Candidates can apply and appear in the JEE Mains 2026 exam irrespective of their class 12 marks.
Previous year question papers are an important source for the JEE Main preparations. However, relying solely upon PYQs is not enough to fully prepare for the JEE Mains exam. Candidates must also focus on covering the entire syllabus, developing strong conceptual understanding, practising time management, and attempting mock tests.
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