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ICSE Class X Sample / Model Paper 2025 : Chemistry

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SHARATH MEMORIAL ICSE SCHOOL Near Kempegowda Circle, Ramanagara. THIRD PREPARATORY EXAMINATION NOVEMBER /2025 Subject: CHEMISTRY (SCIENCE PAPER-2) Time: 2H class- 10TH ICSE Max. Marks: 80 Answers to this Paper must be written on the paper provided separately. You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this Paper is the time allowed for writing the answers. 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 I Choose the correct answer from the following [15] 1. With reference to the portion of the periodic table given below, identify the elements having the smallest and largest atomic size. Group 1 H A Na B 2 13 14 C 15 16 E 17 18 Cl D F a. Na & C b. B & D c. D & B d. F & B 2. The general formula of the some organic compounds are given below identify the correct order from the following. 1 2 3 4 a. b. c. d. Organic compound Alkane Ketone Carboxylic acid Alkyl 1-i, 2-ii, 3-iii, 4-iv 1-iv, 2-ii, 3-i, 4-iii 1-iv, 2-ii, 3-iii, 4-i None of the above General formula i ii iii iv CnH2n+1 CnH2nO CnH2nO2 CnH2n+2 3. The correct order of the acid shows increasing order of release of hydroxyl ion per molecule. a. H3PO4< H3PO4 < CH3COOH < H2SO4 b. CH3COOH < H2SO4 < H3PO3 < H3PO4 c. CH3COOH > H2SO4 > H3PO3 > H3PO4 d. H3PO4> H3PO3 > CH3COOH > H2SO4 4. Ammonia gas is passed through quicklime and then collected in a jar. Red and blue litmus papers are placed in the jar. W, X, Y and Z are the four observations. Which of the above observations correctly shows the reaction of the litmus papers to ammonia? a. b. c. d. W X Y Z Red litmus paper Blue litmus paper W Turns blue Remains blue X Remains red Remains blue Y Remains red Turns red Z Turns blue Turns red 5. The element belongs to 3rd period and 16th group is it has ..valence electron, it forms . ion a) Silicon - 6 electron anion b) Silicon - 6 electron cation c) Sulphur - 6 electrons anion d) Chlorine 6 electron anion 6. Which of the following statement are NOT CORRECT. i. ii. iii. iv. a) b) c) d) Across the period ionisation potential increases because nuclear charge increases Most metallic element present in the bottom of the first group because atomic size increases down the group F has lower electron affinity than Cl because inter electronic repulsion occur in Cl. Cation is smaller than parent atom because nuclear charge is more than the electron. i and ii only i only iii only iv 7. Shri Rama and Lakshmana, two twin brothers, are trying to electroplate their iron cup with silver metal. They set up an electrolytic cell as shown in the diagram below. To complete the process correctly, they asked their friends for advice. Their friends gave the following suggestions: Advice-01-Dhanvanth said to use pure silver as anode. Advice-02-Bhuvan said to add sodium Argento cyanide as electrolyte than silver nitrate. Advice-03-Supreeth said to place iron cup in cathode. Advice-04- Nischith suggested to use AC current. State the correct advice should taken by twin brothers to complete the electroplating. a) All four advices b) Advice 01 and 02 c) Advice 01,02 and 03 d) Advice 02 and 04 8. In the following table, the reactions occurring at electrodes P, Q, R, and S during electrolysis are given. Identify which reaction is incorrect Electrolyte Anode OH1- + 1e OH OH+OH H2O+O O+O O2 1OH + 1e OH OH+OH H2O+O O+O O2 Cathode P Copper sulphate solution using inert electrode Q Acidulated water using graphite electrodes R Electroplating of nickel on article Ni + 2e Ni Ni Ni + 2e S Copper sulphate electrolysis using active electrode of copper OH1- + 1e OH OH+OH H2O+O O+O O2 Cu + 2e Cu a) b) c) d) P&Q Q&R R&S S&P Cu + 2e Cu 2H + 2e H 9. Priyanka tried to polish her dull gold ring using a magic solution that can give shining appearance to ring. The solution she used was most likely made up of two acids. Which of the following correctly represents the composition? a) A mixture of concentrated hydrochloric acid and nitric acid in the ratio 3:1. b) A mixture of concentrated sulfuric acid and nitric acid in the ratio 1:1. c) A dilute solution of hydrochloric acid with dilute solution of nitric acid. d) A mixture of concentrated hydrochloric acid and nitric acid in the ratio 1:3 10. Which statement about a homologous series is true? a) All members have the same molecular mass. b) All members have different functional groups. c) Members differ by a CH unit and have similar chemical properties. d) All member shares different general formula. 11. Which of the following would weigh the least? (Atomic masses C=12, O=16, Na=23) a) 2 gram atoms of oxygen b) one mole of sodium c) 22.4 litre of carbon dioxide at STP d) 6.023 x 1022 atoms of carbon 12. Kannika added three different metals W, X, and Y to separate samples of copper sulphate (CuSO ) solution and recorded the following observations: 1) When metal W was added, the blue colour of copper sulphate solution turned green. 2) When metal X was added, no change was observed. 3) When metal Y was added, a reddish-brown deposit appeared on the surface of metal Y. Based on these observations, arrange the metals W, X, and Y in increasing order of reactivity. a) b) c) d) X<Y<W Y<X<W W<Y<X X<W<Y 13. The description of an organic compound is given below read the following. Molecular formula is C3H8O, Functional group is attached to first carbon atom. Reaction sodium gives hydrogen gas. Identify the compound. a) Ethanal b) Ethanoic acid c) Methanol d) Ethanol 14. The ratio between the volumes occupied by 4.4 grams of carbon dioxide and 2 grams of hydrogen gas is: a) 2.2 : 1 b) 1 : 2.2 c) 1 : 10 d) 10 : 1 15. Subheeksha and Sudheeksha are two twin sisters of class 10th ICSE took two different salt solutions in test tubes C and D. He added dilute HCl to each of the two test tubes. The products formed in the test tubes C and D are silver chloride and lead chloride respectively. Later, Ridhi tested the solubility of product of both the test tubes by adding ammonium hydroxide (NH OH) and noted the following observations: 1) In test tube C, the white precipitate of silver chloride dissolves in excess ammonium hydroxide, giving a clear solution. 2) In test tube D, the white precipitate of lead(II) chloride does not dissolve in excess ammonium hydroxide and remains unchanged 3) No changes occurred. Which of the above statements is/are correct? a) Only 1 is correct b) Only 2 is correct c) Both 1 and 2 are correct d) Only 3 is correct Question 02 i. Study the following diagram and answer the following questions [5] a) Write the chemical equation occurred. b) Write the chemical reaction take place if above experiments is took place in the presence of platinum catalyst at very high temperature. c) Name the manufacturing process used to prepare the ammonia and write its balanced equation. d) Name the experiment used to show that ammonia is highly soluble in water. ii. Identify the statements [5] a) The metallic hydroxide which is soluble in both ammonium hydroxide and potassium hydroxide in analytical experiments. b) The amount of energy released while converting neutral atom into negatively charged ion. c) The type of ore which is concentrated by Froth floatation. d) The number of particles present in 22g of carbon dioxide gas. e) The substance is used to prevent the burning of anode in Hall Heroult s process. iii. Match the Column A with Column B: A 1 2 3 4 5 SO2 Excess of oxygen Acidic salt Al2O3 Ne [5] B I II III IV V VI NaHSO3 React with both acid and base Decolourises KMnO4 ZnS Affinity zero No valence electron iv. Fill in the blanks with the choices given in brackets. [5] 1. Ammonium hydroxide and sodium hydroxide is distinguished by (Ca(NO3)2 / CuSO4 ) 2. When dil. nitric acid reacts with (Mn /Zn) do not produce hydrogen gas because dil. Nitric acid is ..(Reducing / Oxidising ) agent. 3. In CCl4 each chlorine atom share(s) __________ (one / two) electron(s) with the central carbon atom to complete its valence shell. 4. Metal hydroxide of . (Cu / Pb ) soluble in sodium hydroxide 5. The pH of acetic acid is more than dil. Nitric acid. So acetic acid contains . (more / less) concentration of hydrogen ion. v. Write the structural formula for the following.(any 5) [5] a) Structure of Benzene b) First member of aldehyde. c) 3-C ketone d) Isomer of 5-C saturated compound in which one C-atom linked with 3 carbon atom e) The compound obtained after calcium carbide treated with water. f) The compound formed after Cl2 treated ethene in the presence of CCl4. g) Chloroform. SECTION-B Question 03 1. Write the chemical equation for the following and write one relevant observation. [2] a) Excess of ammonia gas reacts with chlorine. b) Heating copper carbonate in heating tube. 2. With chemical equation and name the role of ammonia, carbon and sulphuric acid from the following [3] a) Conc. sulphuric acid treated with reacts with sulphur. b) Reduction of zinc oxide by coke. c) Ammonia is passed over heated copper oxide. 3. The element X has a lower electron affinity but a higher ionisation energy than element Y [3] a) Which element, X or Y, is likely to be the better reducing agent? b) Compare the metallic character of X and Y, giving reasons. c) State whether X is likely to be placed to the left or to the right of Y in the periodic table? 4. Write balanced chemical equations for the following reactions: [2] a) Methyl iodide reduced by hydrogen. b) Ethanol reacts with Al2O3 at 350o C. Question 04 1. Name the composition present in the following alloys: a) Used to make body of aircraft. b) Used to soldering purpose. 2. Write balanced chemical equations for the following: a) Laboratory preparation of ethene. b) Bromine gas is passed over ethene in the presence of carbon tetrachloride. 3. Kavana was given a salt X for analysis which was white in colour. On strong heating it produced a yellow coloured residue when hot and colourless compound when it is cold, Also release a colourless gas, and a reddish-brown gas. a) Identify the metal ion present in the salt. b) Name the test used to test the negative radicle present in the salt. c) How the yellow coloured residue reacts with NaOH give chemical equation? 4. Study the below picture and answer the questions a) Write the chemical reaction takes place. [2] [2] [3] [3] b) Why all glass apparatus are used? Give reason. c) Nitric acid is colourless, but collected acid appears yellow .Give reason. Question 05 1. Identify the reactant and Q and name the anion present in the reactant Q: Dil. hydrochloric acid reacts with compound Q to give a salt of sodium chloride and rotten egg smell gas. [2] 2. Write the chemical equation for the following. [2] a) Ethanol treated with acetic acid in the presence of concentrated sulphuric acid. b) Reduction of acetic acid into ethanol. 3. Study the following configurations and answer the following question. [3] ELEMENT A B C D ATOMIC NUMBER 1 11 17 8 CONFIGURATION 1 2,8,8,1 2,8,7 2,6 a) Which element undergoes oxidation. b) Write the chemical formula formed between the element A with D and B with D. c) Which of the above formed compound show the following property. i. Compound with good Conductor of electricity in molten state. ii. Compound having great force of attraction between the atoms. 4. Study the following diagram and answer the following question. a) Name the manufacturing process. b) How to convert SO2 into SO3 ? c) Why direct absorption of SO2 in water is not possible? Question 06 [3] 1. You are provided with the list of chemicals mentioned below in the box [3] Sodium hydroxide solution, zinc, iron, copper, lead, hydrochloric acid, dil. sulphuric acid, lead carbonate, dil. Nitric acid, chlorine gas, conc.Nitric acid, Barium chloride, sodium carbonate Using suitable chemicals from the list given, write balanced chemical equation for the preparation of the salts mentioned below: a) Lead sulphate. b) Ferric chloride. c) Copper carbonate. 2. Ammonia burns in oxygen as shown below. [2] 4NH3 + 3O2 2N2 + 6H2O If 240 cc of ammonia is burnt in 300 cc of oxygen, find out the composition of the resultant gaseous mixture at room temperature. 3. The following questions relate to the extraction of Aluminium by electrolysis. [3] a) Name the other compound which contains aluminium added to alumina. b) Give a balanced equation for the reaction that takes place at the cathode. c) Give reason metal present higher in the reactivity series are extracted from their molten state by electrolysis? 4. Write the dot diagram. [2] a) Ammonia. b) Hydroxyl ion. Question 07 1. Pratiksha has solution X, Y and Z that has pH 2, 7 and 13 respectively. Which solution: a) Adding . (alkali/acid) to solution Y pH will increases. b) Will liberate carbon dioxide gas when react with copper carbonate ? c) solution Z turns methyl orange into 2. The Empirical formula of an organic compound is CHCl 2. If its relative molecular mass is 168, what is its molecular formula? [At. Wt. C = 12, H = 1, Cl = 35.5] 3. 8.2 grams of calcium nitrate is decomposed by heating according to the equation 2Ca(NO3)2 2CaO + 4NO2 + O2 Calculate the following: a) Volume of nitrogen dioxide obtained at STP. b) Mass of CaO formed. [Atomic weights: Ca 40, N-14, O-16] 4. Arrange the following according to the instructions given in brackets: a) F, Cl, Br,I (Increasing electronegativity) 2+ + 2+ + b) Cu , Na , Zn , Ag (The order of Preferential discharge at the cathode) Question 08 [3] [2] [3] [2] 1. Name the ore. a) Oxide ore of zinc. b) Most commonly used ore of iron. 2. Study the following diagram and answer the following question. [2] [2] - a. Name the experiment illustrated above. b. What are the necessary precaution or arrangements should take to complete the process? 3. Complete and balance the following equations: [3] a) NH4Cl + Ca(OH)2 b) Cu + Conc. HNO3 c) C2H4Br2+ Alco.hot.conc. KOH 4. Give reason for the following. [3] a) HCl is soluble in toluene. b) Ethane is saturated compound and undergoes substitution recation. c) Acetic acid is Mono-basic acid.

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