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ICSE Class X Prelims 2026 : Chemistry (Greenwood High, Bangalore)

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GREENWOOD HIGH SCHOOL, BANNERGHATTA PRELIMINARY EXAMINATION -I(2025-26) SUBJECT: CHEMISTRY GRADE: X DATE: 21-11-2025 1. 2. 3. 4. 3. DURATION: 2 HOURS MAX, MARKS: 80 Answers to this paper must be written on the paper provided separately. You will not be allowed to write during the first 15 minutes. This time is to be spent in reading the question paper The intended marks for questions or parts of questions are given in the brackets J. This question paper consists of 09 printed pages. SECTION A (40 Marks] (Attempt all the questions from this section) Question 1 Choose the correct answers to the questions from the given options. [15] (Do not copy the question,write the correct answers only.) (i) A base which is not an alkali - (a) (b) (c) (d) (ii) Sodium hydroxide Potassium hydroxide Copper hydroxide Calcium hydroxide The salt solution which does not react with ammonium hydroxide solution is (a) Lead nitrate (b) Calcium nitrate (c) Zinc nitrate (d) Copper nitrate (iii) Assertion(A): During electrolysis of acidified water, Oxygen is liberated at the anode. Reason (R):OH- ions are discharged at the anode in preference to S0, ions. (a) (b) (c) (d) Both A and R are true and Ris the correct explanation of A Both A and R are true but R is not the correct explanation ofA A is true but R is false A is false but R is true as with (iv) Ametal which produces hydrogen on reacting with alkali as well A, Iron B. Aluminium C. Magnesium D. Zinc (a) A and B (b) Band C (c) Cand D (d) Band D Page 1 of9 acid is: ()Thediagrart (v) Four reactions are shown below in the diagram: ISTE UNNEL, WATEA NC HINGT Gas P' Air CALCIUu CANDIDE 1. Gas Q' 2, HOFMANN vOLTAMETER Wam water Gas'R' Magnesium Nitride. S Gas 'S! sutfurle -Ca) gacid Drying platinum 'letroee d agent bttory de suppty 3. 4. Identify the gases P, Q, R and S SI, No (a (b) (c) (d) P Hydrogen Ethyne HCI Ammonia R Ammonia HCI HCI Ammonia Ethyne HCI Hydrogen Hydrogen Ethyne Hydrogen Ammonia Ethyne (vi) Dilute H;SO4 and Conc.H2SO4 can be distinguished by : (a) Platinum (b) Gold (c) Copper (d) silver (viil) If relative molecular mass of butane (a) 5 (b) 29 (c) 32 (CAHio) is 58, then its vapour density will be (d) 16 (viii) Cold and dilute Nitric acid reacts with Cu give: (a) NO (b) O2 (c) N2 (d) NO (ix) The main ore used for the extraction of iron is: (a) Calamine (b) Cryolite (c) Haematite (d) Bauxite Page 2 of 9 (x) The diagram given below represents the molecule of an organic compound Key =carbon = 0Xygen =hydrogen =chlorine (a) 3-chloro-butan-1-ol (b) 2-bromo -butan-1-ol (c) 2-chloro-butan -4-o1 (d) 3-bromo-butan-l-ol (xi) When an acid reacts with metal sulphide the products formed are : (a) Salt+ Water (b) Salt + Hydrogen (c) Salt + Water + Sulphur dioxide (d) Salt + Hydrogen sulphide (xii) During the extraction of Aluminium by Hall Heroult's process, the carbon rods are replaced continuously. This is because: (a) minimises heat loss by radiation (b) The carbon anode is consumed (c) It enhances the mobility of ions (d) It lowers the fusion point (xii) Which of the following chains of hydrocarbons undergoes two steps of reactions to become saturated? (a) (b) (c) (d) (xiv) The number of moles in 11g of nitrogen gas is (a) (b) (c) (d) 0.19 0.49 0.29 0.39 Page 3 of9 (xv) Which ion is determined by the test shown in the image? Iron (nSulphate Brown ring Brown Ring Test (a) Chloride (b) Nitrate ( ) Sulphate (d) Phosphate Question 2 () Observe the diagram given below and answer the following questions: [5] A Conc.NaCl(aq) Electrolysis of Conc.NaCl (a) Identify 'A' and 'B' (b) State the product formed at anode. (c) Write the reaction at anode. (4) What would be the product at anode, when dilute NaCl undergoes electrolysis? (ii) Complete the following by choosing the correct answers from the bracket: [Sulphuric acid /Hydrochloric acid does not form an acid salt. (a) (b) Ammonia reacts with exXcess of chlorine to form ammonium chloride] [nitrogen/nitrogen trichloride/ (c) Awhite precipitate of [lead hydroxide /zinc hydroxidel which is insoluble in ammonium hydroxide but soluble in sodium hydroxide solution (d) The [higher/ lower] is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode. (e) Ammonia can convert heated copper oxide to copper. This shows [reducing /oxidising] agent. Page 4 of 9 that ammonia is a [5] i) State the terms for the following: (a) The amount of substance which contains the same number of units as the number of atoms in carbon -12 (b) An atom or a group of atoms joined in a specific manner which is responsible for the characteristic chemical properties of the organic compounds. (C) Anon -conducting vessel containing two electrodes immersed in a solution of electrolytes used to bring about a chemical reaction. (d) Insoluble impurities consisting of ferric oxide, sand etc.which are removed by filtration. (e) The gas has no effect on filter paper dipped in acidified KTCrz0, or KMnO4. (iv) Match Column Awith Column B Column A Column B (a) Calamine 1, Platinum (b) Funnel arrangement 2. Sulphuric acid (c) An explosive 3. Zinc carbonate (d) Non-volatile acid 4. Ammonium nitrate 5. Hydrochloric acid (e) Ostwald's process 6. Vanadium pentoxide (v) (a) Give the IUPAC name of the following organic compounds: 1. CH3 C= CH-CH: CH3 (b) Draw the structural diagram for the following compounds. 1. 4-methyl-pent-2-yne 2. 3-bromo-2,2-dimethylpentan-1-oic acid 3. 2-chloro-3 methyl butan-1-al SECTION -B [40 Marks] (Attempt any four questions.) Question 3 () Give one significant observation when: (a) Lead nitrate is mixed with dilute hydrochloric acid and heated. (b) Moist starch iodide paper is introduced into chlorine gas. Page 5 of9 (2] Observ (i) Rewrite the following statements by adding the correct word as shown in the example: 2) Example: Given Statement: Ammonia changes moist red litmus to blue. Correct Statement: Aqueous ammonia changes moist red litmus to blue (a) Sulphuric acid acts as a dehydrating agent and reacts with hydrated copper sulphate (b) Ethene decolourises bromine, while ethane does not (ii) ldentify only the anion present in each of the following compounds: (a) Asalt M on treatment with a pinch of MnO2 followed by conc. H2SO4 is heated, greenish yellow fumes evolved with a pungent odour. (b) Asalt D is treated with dil. H2SO4 a rotten egg smelling gas evolved which turnsmoist [3] lead acetate paper turns black. (c) A salt P on treatment with dil. H2SO4 produces a gas which fumes in moist air and gives dense white fumes with ammonia. (iv) Write the balanced chemical equation for the following reactions: (a) Reaction of conc. HCl with manganese dioxide. (3] (b) Laboratory preparation of ammonia. (c) Copper treated with concentrated Nitric acid. Question 4 () Name the alloy which is made up of. (a) Lead and Tin (2) (b) Aluminium, Copper, Magnesium and Manganese (ii) A student heated 11.2 grams of element'M (atomic weight 56) with 4.8 grams of elementN (atomic weight 16) to form a compound. Find the empirical formula of the compound obtained by a student. (iii) (a) Name the acid used for the preparation of hydrogen chloride gas in the laboratory. (b) Why is this acid preferred to other acids? (c)Write the balanced chemical equation for the laboratory preparation of hydrogen chloride [2] [3] gas. (iv) Give the balanced equations for the following: (a) Reaction of ethyne with chlorine. (b) Reaction of ethanol with acetic acid. I3] Question 5 (i) (a) State Gay-Lussac's Law (b) Catenation (i) Distinguish by giving balanced equations for the reaction between alcoholic KOH and aqueous KOH by using ethylchloride. Page 6 of9 [2] (iii) Observe the diagram and answer the following questions: Spray Water Dropper Water Blue Lltmus (a) Name another gas other than gas "Y' which has same property and can be demonstrated through this experiment. (b) What property of gas does this experiment demonstrate. (0) What wouldyou observe if blue litmus is replaced by red litmus in the above experiment? (3] (iv) Write the balanced equation for the following conversions Ato C: Y + H0 HCI + Compound P X+ H2 +Zn + CuSOA(aq) Z+ Na2S04 (a) Identify compound P. (b) What would be your observation for the reaction of compound p with aqueoussolution of copper sulphate? (c) Write the reaction taking place between the identified compound P and Zinc. Question 6 () Astudent was asked to perform two experiments based on the instructions given: Observe the picture given below and state one observation for each Experiments 1 [2] (b) Experiment 2 (d) Experiment 1 CONC. H,SO, aqueous solution of Barium chloride -STEAM aqueous 'solution of sodium sulphate CAYSTALS OF SUGAR [2] (ii) Give reasons for the following: (a) Ammonium nitrate is not used in preparation of ammonia. (b) Silica crucible is used in electrolysis of lead bromide. (iii) 1250 cc of oxygen was burnt with 300cc of ethane. Calculate the volume of the unused Oxygen and the volume of CO2 formed. [At.mass C=12, H=1, O=16] Page 7 of9 (3] (iv) State your observation for the (a) Thermal decomposition offollowing: (b) Neutral Iron (I) chloride iscopper nitrate. added to ethanoic acid. (c) Electrolysis of copper sulphate using platinum electrode. Question7 () 13) Arrange the following according to the instructions given in (a) Bthane, Methane, Ethene, Ethyne (Inthe increasingordertheofbrackets: molecular H=1). weighi) (C=l2, (b) Mg?+ Cut, H,Na (In the order of preferential discharge at the cathode) (ii) Identify the substance underlined: (a) The organic compound which when solidified, (b) The dilute acid which acts as oxidising agent. forms an ice like mass. (ii) This is the schematic illustration showing the separation of Observe the diagram and method of impurities from an ore. answer the following questions. COMPRESSED AIR (21 [2] [3] POWDERED ORE + WATER PINE OIL AIP BUBBLES WITH OIL WETTED ORE GANGUE OR MATRIX (a) Identify the method of concentration of ore. (b) Name the ore which can be separated by this method. (c) Can FesO4 be concentrated by this method? Justify. (iv) Observe the diagram and answer the following questions: Sulphur! Sulphur dioxide A |Sulphuric| acid Sulphur trioxide te tF Sodium sulphite (a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C. (b) In this process, sulphuric trioxide is not converted to sulphuric acid by reacting it with water, instead a two-step proOcedure is used. Write the equations for the two steps Page &of9 [3] Question 8 () Choose the correct answer from the list given below: (2] Calamine, Methane, Ethane, Ethene, Cryolite (a) The Ore of Zinc (b) The substance used for artificial ripening of fruits. (1) Ravi heated 367.5 g of KCIO: in a test tube. The decomposition of potassium chlorate took [2) place according to the equation. 2KCIO, 2KCI + 302 [At. Mass K-39, CI-35.5, O=16] Find: (a) the volume of the colourless and odourless gas liberated during the experiment. (b) the weight of the residue left behind in the test tube. (1ii) Write the balanced chemical eguations for the following conversions: PbC) (a) PbO FeCls (b) Fe deliquescent salt. On strong (iv) Abhishek was given a salt Xfor analysis which was white cooling it changes to white, a colourless heating it produced a yellow residue when hot but on with excess of the salt X when tested gas, and also a reddish-brown gas. The solution of ammonium hydroxide produced a gelatinous white precipitate. heated the salt strongly. (a) Name the coloured gas evolved when Abhishek (b) Which cation was present in the sample given to Abhishek? (c) Identify the salt given to Abhishek for analysis **End of Paperk***** Page 9 of9 [3] [3]

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