Hydrogen & s-Block Elements — JEE Main PYQs & Practice Questions

Hydrogen & s-Block Elements is a Chemistry chapter in the JEE Main syllabus. This page brings together 138 previous-year and practice questions on Hydrogen & s-Block Elements, organised into 5 topics: Hydrogen and Hydrides, Hydrogen Peroxide, Alkali Metals, Alkaline Earth Metals and Anomalous Behaviour of Li and Be. Most questions come with a step-by-step solution you can work through free in PrepWiser.

Download Hydrogen & s-Block Elements JEE Main PYQs as a free PDF (with answer key)

Chapter weightage: how many questions each chapter had per shift in the 2024–26 papers.

Hydrogen and Hydrides

• High purity (> 99.95%) dihydrogen is obtained by :
• Statements about heavy water are given below : A. Heavy water is used in exchange…
• The INCORRECT statement(s) about heavy water is (are) (A) used as a moderator in nuclear…
• Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone…
• Which one of the following statements is incorrect?
• Which of the given compounds can enhance the efficiency of hydrogen storage tank?
• Lithium aluminium hydride can be prepared from the reaction of :
• Given below are two statements : one is labelled as Assertion A and the other is…
• The highest industrial consumption of molecular hydrogen is to produce compounds of…
• Which one of the following metals forms interstitial hydride easily?
• The single largest industrial application of dihydrogen is :
• Dihydrogen of high purity (> 99.95%) is obtained through :
• BeCl₂ reacts with LiAlH₄ to give :
• Water does not produce CO on reacting with :
• Match List I with List II List I | List II; A. | Cobalt catalyst | I. | (H₂+Cl₂)…
• During water-gas shift reaction
• Which hydride among the following is less stable?
• Match List I with List II LIST I Type of Hydride | LIST II Example; A. | Electron…
• Given below are two statements : One is labelled as Assertion A and the other labelled…
• Given below are two statements : Statement I : Nickel is being used as the catalyst for…

Hydrogen Peroxide

• Hydrogen peroxide, in the pure state, is :
• In which of the following reactions the hydrogen peroxide acts as a reducing agent?
• The volume strength of 8.9 M H₂O₂ solution calculated at 273 K and 1 atm is ______. (R =…
• '25 volume' hydrogen peroxide means
• Given below are two statements : Statement I : H₂O₂ can act as both oxidising and…
• Given below are two statements. Statement I : Hydrogen peroxide can act as an oxidizing…
• The correct statements about H₂O₂ are : (A) used in the treatment of effluents. (B) used…
• Given below are two statements : Statement I : H₂ O₂ is used in the synthesis of…
• Which one of the following reactions indicates the reducing ability of hydrogen peroxide…
• Which of the following can reduce decomposition of H₂ O₂ on exposure to light :
• Which of the following can be used to prevent the decomposition of H₂ O₂ ?
• Consider the following reaction: 2HSO₄ - (aq)→ _((2) Hydrolysis)^((1) Electrolysis)…
• The starting material for convenient preparation of deuterated hydrogen peroxide (D₂O₂)…
• Given below are two statements : One is labelled as Assertion A and other is labelled as…
• Among the statements (a) - (d), the correct ones are : (a) Decomposition of hydrogen…
• O-O bond length in H₂ O₂ is X than the O-O bond length in F₂ O₂. The O-H bond length in…
• Addition of H₂SO₄ to BaO₂ produces :
• The oxide that gives H₂O₂ most readily on treatment with H₂O is :
• Which of the following equation depicts the oxidizing nature of H₂O₂?

Alkali Metals

• One of the by-products formed during the recovery of NH₃ from Solvay process is :
• Identify the correct statements about alkali metals. A. The order of standard reduction…
• Match List - I with List - II. List I (Salt) | List II (Flame colour wavelength); (a) |…
• The correct order of hydration enthalpies is (A) K⁺ (B) Rb⁺ (C) Mg²⁺ (D) Cs⁺ (E) Ca²⁺…
• On heating, LiNO₃ gives how many compounds among the following __________…
• Match List-I with List-II: List - I | List - II; A. | K | I. | Thermonuclear reactions…
• Match List I with List II. LIST I Alkali Metal | LIST II Emission Wavelength in nm; A. |…
• The density of alkali metals is in the order :
• Alkali metal from the following with least melting point is :
• On combustion of Li, Na and K in excess of air, the major oxides formed, respectively…
• The metal mainly used in devising photoelectric cells is :
• Given below are two statements : one is labelled as Assertion (A) and the other is…
• Find A, B and C in the following reactions : NH₃ + A + CO₂ → (NH₄)₂CO₃ (NH₄)₂CO₃ + H₂O +…
• Match List - I with List - II : List - I | List - II; (a) | Li | (i) | photoelectric…
• The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater…
• The magnetic behaviour of Li₂O,Na₂O₂ and KO₂, respectively, are :
• Metallic sodium does not react normally with :
• Given below are two statements, one is labelled as Assertion A and the other is labelled…
• Correct statement about alkali metal oxides is :
• Choose the correct statement from the following :

Alkaline Earth Metals

• Which one of the following alkaline earth metal ions has the highest ionic mobility in…
• Given below are two statements : Statement I : None of the alkaline earth metal…
• Match List I with List II : List I | List II; A. | Slaked lime | I. | NaOH; B. | Dead…
• A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H₂O gives a…
• The number of water molecules in gypsum, dead burnt plaster and plaster of Paris…
• The products obtained during treatment of hard water using Clark's method are :
• Two elements A and B have similar chemical properties. They don’t form solid…
• What are the products formed in sequence when excess of CO₂ is passed in slaked lime?
• The correct order of density is :
• Among the sulphates of alkaline earth metals, the solubilities of BeSO₄ and MgSO₄ in…
• Match List - I with List - II : List - I | List - II; (a) | Be | (i) | treatment of…
• Ion having highest hydration enthalpy among the given alkaline earth metal ions is :
• The setting time of Cement is increased by adding :
• What is the purpose of adding gypsum to cement?
• Match List I with List II List-I | List-II ; A. | Chlorophyll | I. | Na₂CO₃; B. | Soda…
• Match the following compounds (Column-I) with their uses (Column-II) : S.No. | Column-I…
• The element playing significant role in neuromuscular function and interneuronal…
• When gypsum is heated to 393 K, it forms :
• Mg(NO₃)₂ · XH₂ O and Ba(NO₃)₂ · YH₂ O, represent formula of the crystalline forms of…
• Lime reacts exothermally with water to give 'A' which has low solubility in water…

Anomalous Behaviour of Li and Be

• Which of the following statements are correct? (A) Both LiCl and MgCl₂ are soluble in…
• Which of the following is NOT an anomalous property of lithium?
• Statement I : An alloy of lithium and magnesium is used to make aircraft plates…
• The carbonate of lithium decomposes on heating unlike other alkali metal carbonates…
• Beryllium does not react with water even at high temperature, unlike magnesium. This is…
• Given below are two statements : One is labelled as Assertion A and the other is…
• An alkaline earth metal ‘M’ readily forms water soluble sulphate and water insoluble…
• Given below are two statements: Statement I : Lithium and Magnesium do not form…
• Given below are two statements, one is labelled as Assertion A and the other is labelled…
• Given below are two statements : One is labelled as Assertion A and the other labelled…
• Which of the following reaction is correct?
• Given below are two statements : one is labelled as Assertion (A) and the other is…
• Chlorides of which metal are soluble in organic solvents :
• Given below are two statements : Statement I : Both CaCl₂ . 6H₂O and MgCl₂ . 8H₂O…
• Reaction of BeCl₂ with LiAlH₄ gives : (A) AlCl₃ (B) BeH₂ (C) LiH (D) LiCl (E) BeAlH₄…
• Reaction of BeO with ammonia and hydrogen fluoride gives A which on thermal…
• Match List - I with List - II : List - I | List - II; (a) | NaOH | (i) | Acidic; (b) |…
• Structures of BeCl₂ in solid state, vapour phase and at very high temperature…
• Be(OH)₂ reacts with Sr(OH)₂ to yield an ionic salt. Choose the incorrect option related…
• Given below are two statements: one is labelled as Assertion A and the other is labelled…

More Chemistry chapters

• Mole Concept & Stoichiometry
• Atomic Structure
• Gaseous State
• Chemical Thermodynamics
• Chemical Equilibrium
• Ionic Equilibrium
• Redox Reactions
• Solutions & Colligative Properties
• Electrochemistry
• Chemical Kinetics
• Solid State
• Surface Chemistry
• Nuclear & Radiochemistry
• Periodic Table & Periodicity
• Chemical Bonding & Molecular Structure
• p-Block Elements — Part I (Group 13 & 14)
• Environmental Chemistry
• p-Block Elements — Part II (Group 15-18)
• d & f Block Elements
• Coordination Compounds
• Metallurgy
• Qualitative Analysis — Salt Analysis
• Purification & Characterisation of Organic Compounds
• General Organic Chemistry (GOC)
• Hydrocarbons — Alkanes
• Hydrocarbons — Alkenes & Alkynes
• Hydrocarbons — Aromatic (Arenes)
• Halogen Derivatives — Haloalkanes & Haloarenes
• Alcohols, Phenols & Ethers
• Aldehydes & Ketones
• Carboxylic Acids & Their Derivatives
• Amines & Diazonium Salts
• Carbohydrates & Biomolecules
• Polymers
• Chemistry in Everyday Life
• Practical Organic Chemistry

Frequently asked questions

How many Hydrogen & s-Block Elements questions are there for JEE Main?

PrepWiser has 138 Hydrogen & s-Block Elements questions for JEE Main, grouped into 5 topics such as Hydrogen and Hydrides, Hydrogen Peroxide and Alkali Metals.

Are these Hydrogen & s-Block Elements questions from previous-year JEE Main papers?

Yes — most are genuine previous-year questions from past JEE Main papers, and the rest are practice questions written to match the JEE Main pattern and difficulty.

Where can I see the answers and solutions to these Hydrogen & s-Block Elements questions?

Open any Hydrogen & s-Block Elements question in PrepWiser (it is free) to attempt it; most come with a step-by-step solution.