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ICSE Class X Prelims 2026 : Chemistry (The Shri Ram School (TSRS), Aravali, DLF Phase IV, Gurgaon)

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Aviiral Jain
The Shri Ram School (TSRS), Aravali, DLF Phase IV, Gurgaon

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The Shri Ram School - Aravali Pre-Board Examination (2025 2026) Class: X Subject: Chemistry Time: 2 Hours Max. Marks = 80 (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ---------------------------------------------------------------------------------------------------------------Section A is compulsory. Attempt any four questions from section B. The intended marks for questions or parts of questions are given in brackets [ ] SECTION A (40 Marks) (Attempt all questions from this Section.) Question 1: Choose the correct answer from the options given below: [15] i) Four reactions are shown below in the diagram. Which reaction produces water? (a) 1 and 2 (b) 2 and 3 (c) 3 and 4 (d) 2 and 4 ii) Assertion (A): Froth flotation process is used for the enrichment of sulphide ores. Reason (R): In this process, sulphide ores are preferentially wetted by water while gangue particles are wetted by oil. (a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, but R is not the correct explanation of A. (c) A is true, but R is false. (d) A is false, but R is true. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 1 iii) The diagram shown below shows the electrolysis of copper (II) sulphate. Which of the statements is correct? (a) Copper metal is deposited at the positive electrode. (b) Carbon dioxide gas is produced at the anode. (c) After some time, blue colour of the copper (II) sulphate solution fades away. (d) A few drops of conc. HCl are added as a catalyst. iv) A hydrocarbon when analysed was found to have a vapour density of 22. What is the molecular formula for the hydrocarbon? [C=12, H=1] (a) CH4 (b) C3H8 (c) C2H4 (d) C2H6 v) Assertion (A): Calamine and Fool s gold are ores of iron. Reason (R): Calamine is a carbonate ore that undergoes the process of calcination. (a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, but R is not the correct explanation of A. (c) A is true, but R is false. (d) A is false, but R is true. vi) Carbonic acid is a weak dibasic acid. Which of the following is a correct statement about acid. (a) It completely dissociates in water to produce a high concentration of H3O ions (b) It contains two replaceable hydrogen ions per molecule when dissolved in water. (c) It contains two replaceable OH- ions per molecule when dissolved in water (d) The acid solution needs vigorous stirring to help it release H3O+ ions. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 2 vii) A sample of gas taken from a neon glow lamp does not react even when electric discharge or high temperature is applied. Which property of the gas explains this behavior? (a) It has a very high ionization potential. (b) It has a high electron affinity. (c) The atomic radius of the element is large and hence it loses electrons easily. (d) It only forms covalent bonds. viii) When diluted hydrochloric acid is added to magnesium bisulphite which is used as a soaking solution to relieve minor sprains and bruises, it produces magnesium chloride, water and sulphur dioxide gas. [ Mg(HSO3)2 = 186, HCl =36.5, MgCl2 =95, SO2= 64, H2O = 18] Mg(HSO3)2(s) + 2 HCl(aq) MgCl2(aq) + 2 SO2(g) + 2 H2O(l) Which statement about the above reaction is incorrect? (a) 73 g of HCl produce 95 g of MgCl2. (b) 186 g of Mg(HSO3)2 produces 22.4 L of SO2 at s.t.p. (c) For every mole of Mg(HSO3)2 that reacts, two moles of water are produced. (d) 93 g of Mg(HSO3)2 reacts with 36.5 g of HCl. ix) In a flavouring industry, chemical engineers combine different alcohols and carboxylic acids to produce substances used in ice cream, yogurts, and candies. These substances are known for their sweet, fruity odours. Which type of reactions help produce these compounds? (a) Precipitation reaction forming salts (b) Addition reaction forming halides (c) Esterification reaction forming esters (d) Reduction reaction forming aldehydes x) A chloride solution that does not show any change even when excess of ammonium hydroxide solution is added to it. (a) Calcium chloride (b) Iron (II) chloride (c) Copper (II) chloride (d) Iron (III) chloride TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 3 xi) What happens when ammonia reacts with an excess of chlorine gas? (a) A yellow solid is left behind that is highly explosive in nature. (b) Ammonia reacts with chlorine producing a greenish yellow flame. (c) A yellow oily liquid is seen. (d) Dense white fume is formed. xii) Assertion (A): Polar covalent compounds conduct electricity in aqueous medium. Reason (R): Polar covalent compounds undergo the process of ionization when they are dissolved in water. (a) Both A and R are true, and R is the correct explanation of A. (b) Both A and R are true, but R is not the correct explanation of A. (c) A is true, but R is false. (d) A is false, but R is true xiii) Select the option that correctly represents the electron-dot diagram of the ammonium ion. xiv) When a compound X is treated with concentrated sulphuric acid at 170 degree Celsius, it produced water along with an unsaturated hydrocarbon with two carbon atoms and a molecular weight of 28 amu. Which of the following statements is correct? (a) Compound X is ethane, and it undergoes addition reaction. (b) Compound X is ethanol, and it undergoes dehydration reaction. (c) Compound X is ethanoic acid, and it undergoes neutralization reaction. (d) Compound X is ethyne, and it undergoes substitution reaction. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 4 xv) Ednaa adds a few drops of universal indicator to four test tubes containing different solutions. The colour observed was as follows: Test Tube Colour A Green B Orange C Red D Blue Which is the correct arrangement of the solutions in an increasing order of pH? (a) A < B < C < D (b) A < D < B < C (c) D < C < B < A (d) C < B < A < D Question 2: i) Danish is carrying out the laboratory preparation of methane using the setup shown in the image below. [5] (a) Identify the components A and B. (b) Write a balanced chemical equation for the above reaction. (c) How is methane gas collected? (d) Draw the electron-dot diagram of the final compound formed during the complete chlorination of methane. ii) Identify the following: [5] (a) An alloy of iron used to make surgical instruments. (b) A bond formed between atoms of different elements in which the shared pair of electrons is attracted to one of the bonded atoms. (c) A force of attraction that holds the oppositely charged ions together in an ionic bond. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 5 (d) The salt formed by the partial replacement of the hydroxyl ions of a diacidic or triacidic base. (e) An alcohol used to denature ethanol. iii) Match Column A with Column B: [5] Column A Column B (a) Sugar Solution 1. Aircrafts (b) Reacts with both acid and base 2. Sodium oxide (c) Sulphuric acid 3. Non-electrolyte (d) Duralumin 4. Preservation (e) Ethanoic acid 5. Strong electrolyte 6. Aluminium oxide iv) Complete the following by choosing the correct answers from the bracket: [5] (a) ________ is an alloy that is made up of lead and tin. (Bronze/ Solder/ Duralumin) (b) Formation of chloroform from methane and chlorine is an example of __________ reaction. (Dehydration/ Elimination/ Substitution) (c) The ratio between the volumes occupied by 92 grams of NO2 and 28 grams of N2 gas at S.T.P is _______. [N=14, O=16] (2:1/ 1:2/ 3.2:1) (d) _________ is a good reducing agent. (Conc. HCl/ Conc. H2SO4/ Conc. HNO3) (e) _________ belongs to the same homologous series as acetic acid. (HCHO/ HCOOH/ CH3COONa) v) Answer the following questions. [5] (a) Write the I.U.P.A.C. names of the following compounds: 1. 2. 3. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 6 (b) Draw the structural diagram for the following compounds: 1. 2,3-Dimethylbutanal 2. 2-Ethyl-3-methylbutanoic acid SECTION B (40 Marks) (Attempt any four questions.) Question 3: i) The diagram shows the experimental setup of the laboratory preparation of an acidic gas. Answer the following questions related to the diagram: [5] (a) Name the component Y. (b) Write a balanced chemical equation for the above reaction. (c) ________ is used as the drying agent. (Conc. H2SO4/ CaO/ P2O5) (d) Draw the electron-dot diagram of the acidic gas produced. (e) What will you observe when the aqueous solution of the gas is reacted with sodium sulphide? ii) State giving reasons if: [2] (a) Ethanol and Ethanoic acid cannot be differentiated using a piece of sodium. (b) Both silver nitrate and sodium argentocyanide can be used during the electroplating of silver. iii) The brown color on the surface of roasted coffee beans comes from a compound formed during the Maillard reaction. A simplified version of one such browning compound contains 40% carbon, 6.71% hydrogen, and the rest is oxygen by mass. Find its empirical formula. [C=12, H=1, O=16] TSRS/ AR/Chemistry/ Preboard 2025 [3] The paper consists of 12 printed pages Page 7 Question 4: i) It was Family Day at the metallurgy factory, so Ardeshir got to visit his uncle s workplace. He was amazed to see the huge set-ups used for the concentration of ore, and his uncle explained that this was a gravity separation technique. Answer the following questions to help him understand more about this technique. [2] (a) What is the other name of this technique? (b) This technique makes use of the difference in the _________ (solubility/ density/ colour) of the ore and the impurity to separate them. ii) The metallic character of element X is greater than that of element Y. [4] (a) How is the reducing power of X likely to compare with that of Y? (b) How is the electronegativity of X likely to compare with that of Y? (c) If another element Z has the same number of shells as X and Y but a larger atomic radius than both, then Z is likely to be placed on the _______ (right/left/center) of X and Y. (d) Place the elements X, Y and Z in an increasing order of their reactivity. iii) Identify the compound shown in the image given below: [1] iv) Identify the reactants P, Q, and R in the following reactions: [3] (a) Zinc oxide + P Zinc + Carbon dioxide (b) Q + Warm water Aluminium hydroxide + Ammonia (c) Excess R + Chlorine Ammonium chloride + Nitrogen Question 5: i) Arrange the following based on the instructions given in the bracket: [3 ] (a) Cl-, NO3-, I-, Br- (increasing order of ease of oxidation) (b) F, I, Br, Cl (decreasing order of electron affinity) (c) Potassium, Lithium, Rubidium, Sodium, Cesium (increasing metallic character) TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 8 ii) Give one significant observation when: [3] (a) Ammonia gas is passed over hot copper (II) oxide. (b) Concentrated sulphuric acid is added to sugar. (c) Molten lead bromide undergoes the process of electrolysis. iii) In early 1800s, aluminium was so rare that even Napoleon III of France would show off his opulent personal dinnerware of aluminum to impress his royal guests. But the discovery of the Hall-Heroult process changed everything, making aluminium cheap and widely available. Funny how a metal once fit for kings now wraps our lunch sandwiches. Answer some questions related to the Hall-Heroult process. [4] (a) Why is it important to add other substances to alumina during its electrolysis? (b) Write the reaction at the cathode. (c) The graphite anode needs to be replaced periodically. Justify this statement. (d) Powdered coke sprinkled over the electrolytic mixture. This is done because: 1. The carbon in coke is inert and improves the conductivity of the mixture. 2. Coke minimizes the heat loss due to radiation. 3. Coke is highly porous and helps in removing colour and odour. 4. The coke acts like a catalyst and improves the speed of the reaction. Question 6: i) Complete the table given below: Name of the process [3] Reactants Acid product formed (a) __________ Oleum + water Sulphuric acid (b) ___________ Nitrogen dioxide + water + oxygen (c) _____________ ii) Answer the following questions with respect to the concentration of ore in Baeyer s process. [2] (a) Write a balanced chemical equation to convert sodium aluminate to aluminium hydroxide. (b) Explain if this process can be carried out if both the ore and its impurities were amphoteric in nature. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 9 iii) Ramesh works at a metal fabrication shop. Every morning, he checks his oxy-acetylene welding torch before starting work Today, he notices the cylinder has 40 L of acetylene, so he decides to estimate how long his torch will last. For this, he recalls the combustion equation for acetylene: 2C2H2 (g) + 5O2 (g) [3] 4CO2 (g) + 2H2O (g) (a) If air contains just 21% of oxygen, how many litres of air would Ramesh need? (b) Find the volume of carbon dioxide generated during the process. iv) Distinguish between the following using a suitable chemical test: [2] (a) Ethane and Ethene (b) Dilute nitric acid and concentrated nitric acid Question 7: i) In class, the teacher performed the electrolysis of water. Test tube A collected a gas twice as fast as Test tube B and burnt with a pop sound while test tube B made a glowing splinter rekindle. Answer the following questions to better understand the process. [4] (a) Why is acidified water used instead of pure water? (b) Inert electrodes like graphite or _______ (Copper/ Platinum) can be used for the process. (c) Write the reaction at the anode. (d) Write the reaction at the cathode. ii) Identify the substance underlined, in the following cases: [3] (a) An acid salt formed when sulphuric acid partially reacts with NaOH. (b) A gaseous compound formed by the dehydrohalogenation of ethyl bromide. (c) A cation that gives an inky blue solution when excess NH4OH solution is added to it. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 10 iii) You are provided with a list of chemicals mentioned below. Using suitable chemicals, write a balanced chemical equation for the preparation of the following compounds. (No chemical should be used more than once) [3] Sulphur, Silver nitrate, Hydrochloric acid, Sodium hydroxide, Sodium chloride, Iron, Sodium, Sulphuric acid, Silver, Chlorine (a) Iron (II) chloride (b) Sodium sulphate (c) Silver chloride Question 8: i) State the property exhibited by sulphuric acid in each of the following reactions: [3] (a) Blue vitriol and concentrated sulphuric acid (b) Sodium carbonate and dilute sulphuric acid (c) Carbon and concentrated sulphuric acid ii) A student was asked to perform two different experiments in the laboratory. [2] In experiment A when the compound was heated strongly, a crackling sound was observed along with the release of a reddish-brown gas. In experiment B when acid was added to a salt solution, it released a colourless gas that decolourized the pink KMnO4 paper. To the same salt solution when a few drops of NaOH were added a dirty green precipitate was formed. A B Identify the compound: (a) Heated in experiment A (b) The salt being tested in experiment B TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 11 iii) Identify the type of isomerism shown in the image below: [1] iv) All alkalis are bases but not all bases are alkalis. Justify the statement given. [1] v) Draw the electron-dot diagram for the following: [3] (a) A diatomic gas with two lone pair of electrons. (b) A colourless and odourless liquid having pH 7. (c) A white-coloured compound formed when a magnesium ribbon is burnt in air. TSRS/ AR/Chemistry/ Preboard 2025 The paper consists of 12 printed pages Page 12

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