ICSE Chemistry Answer Key 2026 LIVE: Paper Difficulty Level; Solved Question Paper

ICSE Chemistry Exam 2026 LIVE

• Mar 11, 2026 11:00 AM IST

  Exam Starts

  The examination has started. Candidates have 2 hours to finish the paper. The exam will conclude at 11, shortly which the exam analysis and unofficial answer key will be provided here. Stay tuned!

• Mar 11, 2026 10:00 AM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Tests for Unsaturation

  Unsaturated hydrocarbons like Ethene and Ethyne will decolorize Bromine water (brown to colorless) and Alkaline Potassium Permanganate. Saturated Alkanes like Methane do not show this reaction.

• Mar 11, 2026 09:00 AM IST

  Short Note on Isomerism

  Isomers are compounds that share the same molecular formula but have different structural arrangements. Common examples to practice for the exam are the chain isomers of Butane and Pentane.

• Mar 11, 2026 08:00 AM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on IUPAC Nomenclature

  When naming organic compounds, identify the longest carbon chain first, then number it to give the functional group the lowest possible position. Functional groups like –OH (Alcohol) and –CHO (Aldehyde) determine the suffix.

• Mar 11, 2026 07:00 AM IST

  Short Note on Dehydrating Agent

  Concentrated Sulphuric Acid is a powerful dehydrating agent that removes chemically combined water. It can char organic matter like paper or sugar, leaving behind a black mass of carbon.

• Mar 11, 2026 06:00 AM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Contact Process

  Sulphuric Acid is produced by oxidizing Sulphur Dioxide to Sulphur Trioxide using a Vanadium Pentoxide (V_2O_5) catalyst. SO_3 is then absorbed in concentrated H_2SO_4 to form Oleum, which is later diluted.

• Mar 11, 2026 05:00 AM IST

  Short Note on Ostwald’s Process

  Nitric Acid is manufactured by the catalytic oxidation of Ammonia over Platinum gauze at 800°C. The resulting Nitric Oxide is further oxidized and dissolved in water to form HNO_3.

• Mar 11, 2026 04:00 AM IST

  ICSE Board 10th Chemistry Exam 2026: Short Note on ​​​​​​​​​​​​​​Haber’s Process

  Ammonia is industrially produced from Nitrogen and Hydrogen at 450°C and 200 atm pressure. Finely divided iron is used as the catalyst, while Molybdenum acts as a promoter to increase efficiency.

• Mar 11, 2026 03:00 AM IST

  Short Note on The Fountain Experiment

  This experiment is the primary proof that gases like HCl and Ammonia are extremely soluble in water. It also demonstrates their acidity or alkalinity based on the color change of the litmus fountain.

• Mar 11, 2026 02:00 AM IST

  ICSE Board 10th Chemistry Exam 2026: Short Note on Laboratory Prep of HCl

  Hydrogen Chloride gas is prepared by reacting Sodium Chloride with concentrated Sulphuric Acid below 200°C. It is collected by the upward displacement of air because it is heavier than air and highly soluble in water.

• Mar 11, 2026 01:00 AM IST

  Short Note on Hall-Heroult Process

  This process extracts Aluminum from Alumina using a mixture of Cryolite and Fluorspar as the electrolyte. Cryolite is essential because it lowers the fusion point and increases the conductivity of the mixture.

• Mar 11, 2026 12:00 AM IST

  ICSE Board 10th Chemistry Exam 2026: Exam Today

  CISCE will conduct ICSE Board 10th Chemistry Exam 2026 today, March 11. The examination will be held from 11 AM in pen and paper mode. 

• Mar 10, 2026 11:00 PM IST

  Short Note on Electroplating

  To plate an object with Silver, the object is made the cathode and a block of pure Silver is the anode. The electrolyte must be Sodium Argentocyanide to ensure a smooth, firm coating of the metal.

• Mar 10, 2026 10:00 PM IST

  ICSE Board 10th Chemistry Exam 2026: Short Note on Electrolysis of Lead Bromide

  When molten PbBr_2 is electrolyzed using graphite electrodes, silvery-grey Lead is deposited at the cathode. Meanwhile, reddish-brown Bromine vapors are evolved at the anode.

• Mar 10, 2026 09:30 PM IST

  Short Note on Vapour Density

  The relative molecular mass of a gas is calculated as 2 \times Vapour \text{ } Density. This relationship is crucial for converting empirical formulas into molecular formulas in numerical problems.

• Mar 10, 2026 09:00 PM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Mole Concept

  Gay-Lussac’s Law states that gases react in volumes that bear a simple whole-number ratio to one another at constant temperature and pressure. Remember that 1 mole of any gas at STP occupies exactly 22.4 liters.

• Mar 10, 2026 08:30 PM IST

  Short Note on Analytical Chemistry (NH4OH)

  This reagent is used to distinguish Copper ions (Cu^{2+}), which form a pale blue precipitate that dissolves in excess NH_4OH to create a deep inky blue solution.

• Mar 10, 2026 08:00 PM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Analytical Chemistry (NaOH)

  Adding Sodium Hydroxide to metallic salts helps identify cations by precipitate color. For instance, Fe^{2+} gives a dirty green precipitate, while Fe^{3+} produces a reddish-brown precipitate, both of which are insoluble in excess NaOH.

• Mar 10, 2026 07:30 PM IST

  Short Note on Amphoteric Oxides

  These are metal oxides, such as ZnO, PbO, and Al_2_O_3, that react with both acids and strong bases to produce salt and water. This dual behavior is a favorite topic for Section B equations.

• Mar 10, 2026 07:00 PM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Characteristic of Acids

  Mineral acids like HCl and H_2SO_4 ionize in water to produce hydronium ions. They react with active metals to release Hydrogen gas and turn blue litmus paper red.

• Mar 10, 2026 06:30 PM IST

  Short Note on Coordinate Bonding

  This bond is formed when one atom provides both electrons for a shared pair. Typical examples include the formation of the Ammonium ion (NH_4^+) and the Hydronium ion (H_3O^+) from a lone pair donor.

• Mar 10, 2026 06:00 PM IST

  ICSE Board Class 10 Chemistry Exam 2026: Short Note on Periodic Trends

  Atomic size decreases across a period due to increased nuclear charge, while Ionization Potential and Electronegativity increase. Conversely, down a group, atomic size increases because new shells are added, making it easier to lose electrons.

• Mar 10, 2026 05:30 PM IST

  ICSE 10th Chemistry Exam 2026: Important Topic 22 for Last-Minute Preparation

  Master the chemical tests to distinguish between saturated and unsaturated hydrocarbons using Bromine water or Baeyer's Reagent. Unsaturated compounds like Ethene will decolorize these reagents, while saturated compounds like Ethane will not.

• Mar 10, 2026 05:00 PM IST

  Important Topic 21 for Last-Minute Preparation

  Learn to draw Chain and Position isomers for simple alkanes and alkenes, such as Butane and But-1-ene. You must be able to define isomers as compounds with the same molecular formula but different structural arrangements.

• Mar 10, 2026 04:30 PM IST

  Important Topic 20 for Last-Minute Preparation

  Practice the naming rules for organic compounds, focusing on identifying the longest carbon chain and the correct functional group suffix. Ensure you can name alcohols, aldehydes, and carboxylic acids with up to five carbon atoms.

• Mar 10, 2026 04:00 PM IST

  ICSE 10th Chemistry Exam 2026: Important Topic 19 for Last-Minute Preparation

  Recognize the role of concentrated Sulphuric Acid as a dehydrating agent that removes chemically combined water from substances. A classic example to memorize is the charring of sugar, which leaves behind a black, spongy mass of carbon.

• Mar 10, 2026 03:30 PM IST

  Important Topic 18 for Last-Minute Preparation

  Revise the Contact Process, where SO_2 is oxidized to SO_3 using a Vanadium Pentoxide catalyst. You must understand why SO_3 is absorbed in concentrated H_2SO_4 to form Oleum instead of being dissolved directly in water.

• Mar 10, 2026 03:00 PM IST

  Important Topic 17 for Last-Minute Preparation

  Study the powerful oxidizing nature of concentrated Nitric Acid when it reacts with non-metals like Carbon or Sulphur. These reactions typically produce Nitrogen Dioxide gas (NO_2), water, and the oxide of the non-metal.

• Mar 10, 2026 02:45 PM IST

  ICSE Chemistry Exam 2026: Important Topic 16 for Last-Minute Preparation

  Review Ostwald’s Process, specifically the catalytic oxidation of ammonia into nitric oxide over platinum gauze. Note that the temperature must be maintained at 800°C for the reaction to proceed efficiently.

• Mar 10, 2026 02:30 PM IST

  Important Topic 15 for Last-Minute Preparation

  Understand how the Fountain Experiment demonstrates that Ammonia gas is both highly soluble in water and basic in nature. The red litmus solution turning into a blue fountain is the definitive visual proof for these properties.

• Mar 10, 2026 02:15 PM IST

  Important Topic 14 for Last-Minute Preparation

  Focus on Haber’s Process for the industrial manufacture of ammonia from nitrogen and hydrogen. You must state the required conditions, which include a 450°C temperature, 200 atm pressure, and a finely divided iron catalyst.

• Mar 10, 2026 02:00 PM IST

  ICSE Chemistry Exam 2026: Important Topic 13 for Last-Minute Preparation

  Study the laboratory preparation of HCl gas using Sodium Chloride and concentrated Sulphuric Acid at temperatures below 200°C. Be sure to explain why H_2SO_4 is used as the drying agent due to its non-volatile nature.

• Mar 10, 2026 01:45 PM IST

  Important Topic 12 for Last-Minute Preparation

  Memorize the electrolyte mixture of Alumina, Cryolite, and Fluorspar used in the extraction of aluminum. Cryolite is essential because it lowers the fusion temperature and increases the overall electrical conductivity.

• Mar 10, 2026 01:30 PM IST

  Important Topic 11 for Last-Minute Preparation

  Revise the concentration of Bauxite ore through Baeyer’s Process, focusing on the chemical reactions that turn the ore into pure Alumina. You must know why sodium hydroxide is used to dissolve the aluminum while leaving impurities behind.

• Mar 10, 2026 01:15 PM IST

  ICSE Class 10 Chemistry Exam 2026: Important Topic 10 for Last-Minute Preparation

  Learn the specific conditions for electroplating an object with Silver, including using the object as the cathode and a block of pure silver as the anode. The electrolyte must be a solution of the metal being plated, such as Sodium Argentocyanide.

• Mar 10, 2026 01:00 PM IST

  Important Topic 9 for Last-Minute Preparation

  Study the Electrochemical Series to predict which ions will be preferentially discharged at the electrodes. Remember that ions lower in the series, like Cu^{2+} or H^+, are discharged more easily than those higher up.

• Mar 10, 2026 12:45 PM IST

  Important Topic 8 for Last-Minute Preparation

  Practice calculating the Empirical Formula from the percentage composition of elements in a compound. You must then use the given molecular weight to determine the final Molecular Formula by finding the value of n.

• Mar 10, 2026 12:30 PM IST

  ICSE Class 10 Chemistry Exam 2026: Important Topic 7 for Last-Minute Preparation

  Use the relationship that Molecular Weight is exactly twice the Vapour Density to solve stoichiometric problems. This conversion is often a small but vital step in finding the molecular formula of an unknown gas.

• Mar 10, 2026 12:15 PM IST

  Important Topic 6 for Last-Minute Preparation

  Review Gay-Lussac’s Law of Combining Volumes, which states that gases react in simple whole-number ratios by volume. Ensure you can solve numerical problems to find the volume of unused reactants at the end of a reaction.

• Mar 10, 2026 12:00 PM IST

  Important Topic 5 for Last-Minute Preparation

  Study the dual nature of oxides like Zinc Oxide (ZnO) and Aluminum Oxide (Al_2O_3), which react with both acids and alkalis. Be prepared to write balanced equations showing these oxides forming salts with sodium hydroxide.

• Mar 10, 2026 11:45 AM IST

  ICSE Board Chemistry 10th Exam 2026: Important Topic 4 for Last-Minute Preparation

  Memorize the distinct colors of precipitates formed when NaOH or NH_4OH is added to metallic salt solutions. You must also know which precipitates, like Zinc or Lead hydroxide, redissolve when an excess of the reagent is added.

• Mar 10, 2026 11:30 AM IST

  Important Topic 3 for Last-Minute Preparation

  Understand that a coordinate bond is formed when one atom provides both electrons for a shared pair. Focus specifically on the formation of the Ammonium ion (NH_4^+) and the Hydronium ion (H_3O^+).

• Mar 10, 2026 11:15 AM IST

  Important Topic 2 for Last-Minute Preparation

  Practice drawing Electron Dot Structures for covalent molecules like methane (CH_4) and ammonia (NH_3). Ensure you clearly distinguish between the electrons of different atoms using dots and crosses to show the sharing of pairs.

• Mar 10, 2026 11:00 AM IST

  ICSE Board Chemistry 10th Exam 2026: Important Topic 1 for Last-Minute Preparation

  Master the periodic trends such as Ionization Potential and Electronegativity, which both increase across a period but decrease down a group. You must be able to explain these shifts based on changes in nuclear charge and atomic radius.

• Mar 10, 2026 10:45 AM IST

  ICSE Board Chemistry Class 10 Exam 2026: Expected Question 22

  Topic	Expected Question	Answer/Result
  Study of Compounds	Why does pure Nitric acid turn yellow over time?	Thermal decomposition releases NO2​ gas which dissolves in the acid.

• Mar 10, 2026 10:30 AM IST

  Expected Question 21

  Topic	Expected Question	Answer/Result
  Organic Chem	Give the IUPAC name for CH3​−CH2​−CHO	Propanal

• Mar 10, 2026 10:00 AM IST

  Expected Question 20

  Topic	Expected Question	Answer/Result
  Stoichiometry	O2​ volume required to burn 100 cm³ of Ethyne?	250 cm³ (based on the 2:5 Gay-Lussac ratio).

• Mar 10, 2026 09:45 AM IST

  ICSE Board Chemistry Class 10 Exam 2026: Expected Question 19

  Topic	Expected Question	Answer/Result
  Metallurgy	Constituents and use of Solder alloy.	Lead (Pb) and Tin (Sn); used for joining electrical wires.

• Mar 10, 2026 09:30 AM IST

  Expected Question 18

  Topic	Expected Question	Answer/Result
  Analytical Chem	Which cation forms a white ppt soluble in excess NaOH?	Zinc ion (Zn2+).

• Mar 10, 2026 09:15 AM IST

  Expected Question 17

  Topic	Expected Question	Answer/Result
  Electrolysis	Observation of CuSO4​ electrolysis with Cu electrodes.	Blue color of electrolyte remains unchanged; Anode thins, Cathode thickens.

• Mar 10, 2026 09:00 AM IST

  Expected Question 16

  Topic	Expected Question	Answer/Result
  Mole Concept	Calculate molecules in 4.4 g of CO2​.	6.022×1022 molecules (calculated as 0.1×NA​).

• Mar 10, 2026 08:45 AM IST

  ICSE Board Chemistry Class 10 Exam 2026: Expected Question 15

  Topic	Expected Question	Answer/Result
  Periodic Trends	Which is the most electronegative element?	Fluorine (F).

• Mar 10, 2026 08:30 AM IST

  Expected Question 14

  Topic	Expected Question	Answer/Result
  Acids & Salts	Define an Acid Salt with an example.	Formed by partial replacement of H atoms. Example: NaHSO4​.

• Mar 10, 2026 08:15 AM IST

  ICSE Chemistry 10th Exam 2026: Expected Question 13

  Topic	Expected Question	Answer/Result
  Organic Chem	First stage of Methane chlorination equation.	CH4​+Cl2​hv​CH3​Cl+HCl

• Mar 10, 2026 07:45 AM IST

  Expected Question 12

  Topic	Expected Question	Answer/Result
  HCl Gas	Purpose of the Inverted Funnel arrangement?	Prevents back-suction and provides a larger surface area for absorption.

• Mar 10, 2026 07:30 AM IST

  Expected Question 11

  Topic	Expected Question	Answer/Result
  Identification	How does SO2​ affect Potassium Dichromate paper?	It turns the orange acidified paper to green.

• Mar 10, 2026 07:15 AM IST

  ICSE Chemistry 10th Exam 2026: Expected Question 10

  Topic	Expected Question	Answer/Result
  Organic Chem	Define Homologous series and the Alkyne formula.	Compounds with same functional group; Alkyne formula: Cn​H2n−2​.

• Mar 10, 2026 07:00 AM IST

  Expected Question 9

  Topic	Expected Question	Answer/Result
  Sulphuric Acid	Why is SO3​ dissolved in H2​SO4​ instead of water?	Directly adding to water creates an uncontrollable acid mist.

• Mar 10, 2026 06:45 AM IST

  ICSE Chemistry Exam 2026: Expected Question 8

  Topic	Expected Question	Answer/Result
  Nitric Acid	Give the catalytic oxidation equation for Ammonia.	4NH3​+5O2​Pt,800∘C​4NO+6H2​O+Δ

• Mar 10, 2026 06:30 AM IST

  Expected Question 7

  Topic	Expected Question	Answer/Result
  Ammonia	What are the Haber’s Process conditions?	Temp: 450°C; Pressure: 200-900 atm; Catalyst: Finely divided Iron.

• Mar 10, 2026 06:15 AM IST

  ICSE Chemistry Exam 2026: Expected Question 6

  Topic	Expected Question	Answer/Result
  Hydrogen Chloride	Why is HCl gas collected by upward displacement of air?	It is heavier than air and highly soluble in water.

• Mar 10, 2026 06:00 AM IST

  Expected Question 5

  Topic	Expected Question	Answer/Result
  Metallurgy	Name the main ore of Aluminium and its concentration process.	Ore: Bauxite; Process: Baeyer’s Process (Chemical concentration).

• Mar 10, 2026 05:45 AM IST

  Expected Question 4

  Topic	Expected Question	Answer/Result
  Electrolysis	Why is the Hall-Heroult anode replaced periodically?	Oxygen reacts with the carbon anode to form CO2​, consuming it.

• Mar 10, 2026 05:30 AM IST

  ICSE Chemistry Class 10 Exam 2026: Expected Question 3

  Topic	Expected Question	Answer/Result
  Chemical Bonding	Why do Ionic compounds have high melting points?	Strong electrostatic forces between ions require high energy to break.

• Mar 10, 2026 05:15 AM IST

  Expected Question 2

  Topic	Expected Question	Answer/Result
  Analytical Chemistry	What is the observation for the "Brown Ring Test"?	A brown ring forms at the junction of the two liquids, indicating Nitrates.

• Mar 10, 2026 05:00 AM IST

  ICSE Chemistry Class 10 Exam 2026: Expected Question 1

  Topic	Expected Question	Answer/Result
  Periodic Table	Why does atomic size decrease across a period?	Increased nuclear charge pulls valence electrons closer to the nucleus.