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ICSE Class X Prelims 2026 : Chemistry (Sharath Memorial ICSE School, Ramanagaram)

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SHARATH MEMORIAL ICSE SCHOOL Near Kempegowda Circle, Ramanagara. FOURTH PREPARATORY EXAMINATION SEPTEMBER/2025 Subject: CHEMISTRY Time: 2h:15min class- 10TH ICSE Max. Marks: 80 Section A is compulsory. Attempt any four questions from Section B. You will not be allowed to write during first 15 minutes, This time is to be spent in reading the question paper SECTION -A I Choose the correct answer from the following [15] 1) A white precipitate is formed when dilute hydrochloric acid reacts with X . The white precipitate is soluble in excess of NH4OH and insoluble in dilute HNO3. Identify X . a) AgNO3 b) NH4Cl c) AgCl d) CaCl2 2) Sodium hydroxide can react with ............... acid to form an acid salt. a) Nitric acid b) Hydrochloric acid c) Acetic acid d) Sulphuric acid 3) Assertion (A): In a solution containing equal concentration of Ag+ ions and Ca2+ ions, Ag+ ions will be discharged in preference to Ca2+ ions. Reason (R): Ag+ ions are placed below Ca2+ ions in the electrochemical series. a) Both (A) and (R) are true, and (R) is the correct explanation of (A). b) Both (A) and (R) are true, and (R) is not the correct explanation of (A). c) (A) is true but (R) is false. d) (A) is false but (R) is true. 4) The oxide which reacts with both dilute hydrochloric acid and sodium hydroxide solution to form salt and water is: a) Basic oxide b) Amphoteric oxide c) Acidic oxide d) Neutral oxide 5) Ethyne is compound all valency of carbon is by hydrogen and undergoes .. reaction. a) Saturated, satisfied, addition b) Saturated ,not satisfied, addition c) Unsaturated ,satisfied, addition d) Unsaturated ,not satisfied, addition 6) Aqueous copper (II) sulphate is electrolysed using copper electrodes. Which statement about the electrolysis is not correct? a) An oxidation reaction occurs at the positive electrode. b) The current is carried through the electrolyte by ions. c) The positive electrode loses mass. d) The number of copper (II) ions in the electrolyte decreases. 7) 40 cm3 of methane (CH4) is reacted with 60 cm3 of oxygen. The equation for the reaction is given : CH4 + 2O2 CO2 + 2H2O All volumes are measured at room temperature. What is the total volume of the gases remaining at the end of the reaction? a) 60 cm3 b) 40 cm3 c) 45 cm3 d) 50 cm3 8) Which of the following has greater electron affinity? a) F b) Cl c) Br d) I 9) Which of the following statement is NOT the property of ionic compound? a) High melting and boiling point b) Soluble in water c) Conduct electricity in molten state d) Soluble in organic compounds 10) Salt which contains .. ion produce reddish brown precipitate with sodium hydroxide. a) Fe2+ b) Fe3+ c) Ca2+ d) Zn2+ 11) Atomic number of the element is 16 it has Valence electrons, form.. .ion and it is agent. a) 6,cation and oxidising b) 6,cation and reducing c) 6,anion and oxidising d) 6,anion and reducing 12) The correct order to get Zinc from Zinc blende is. 1 pulverisation 2 Magnetic separation a) 1,2,3,4,5,6,7 b) 1,3,4,5,7 3 Froth floatation 4 5 6 7 Calcination Reduction Roasting Refining c) 1,3,4,6,7 d) 1,3,6,5,7 13) The gas formed when copper heated with dil.nitric acid is. a) NO b) N2 c) N2O d) NO2 14) The two main metals in Bronze are: a) Copper and zinc b) Copper and lead c) Copper and nickel d) Copper and tin 15) The acid that fumes in moist air : a) HCI b) HNO3 c) H3PO4 d) NaOH Question 02 i. Answer the following question [5] The following sketch represents the electroplating of an Iron cup with Nickel metal. Study the diagram and answer the following questions: (a) During electroplating the iron cup is placed at the cathode. Why? (b) Name the ion that must be present in the electrolyte. (c) State one condition that is necessary to ensure that the deposit is smooth, firm and even. (d) Write the reaction taking place at the cathode. (e) What change would you observe at the anode? ii. Identify the statements [5] a) A homogeneous mixture of metal and metal or with non-metal in definite proportion. b) The tendency of an atom to pull a shared pair of electrons towards itself in a compound. c) A reaction in which unsaturated compound become a saturated compound by adding hydrogen in the presence of nickel catalyst is called. d) The compound formed by sharing a pair of electrons, the shared pair of electros are not equally distributed. e) The metal whose oxide can be reduced by ammonia, hydrogen, coke and carbon monoxide reducing agents. iii. Match the Column A with Column B: [5] COLUMN-A COLUMN-B 1 Sodium sulphate 2 FeCl3 3 Nitrous oxide 4 Contact process C titration D combination 5 Dibasic acid E Ammonium nitrate A V2O5 B Produce 2 hydronium ion F Neutralisation iv. Fill in the blanks with the choices given in brackets. [5] 1. Excess ammonia reacts with chlorine to form ............... [nitrogen / nitrogen trichloride] 2. If an element has 7 electron in the outermost shell, then it is likely to have the ............... [smallest/largest] atomic size amongst all the elements in the same period. 3. In CCl4 each chlorine atom share(s) __________ (one / two) electron(s) with the central carbon atom to complete its valence shell. 4. An ............... [alkaline/acidic] solution will turn methyl orange solution pink or red. 5. The compound that does not have a lone pair of electrons is .............. (water /ammonia, carbon tetra chloride) v. a. Write the structural formula for the following. [3] a) But-2-ene b) Methanoic acid c) 2 chloro pentanol b. Write IPUAC name for the following [2] a) b) SECTION-B Question 03 1. Name the gas released: a) Sulphur react with conc.sulphuric acid. b) Sodium acetate heated with soda lime at 300 oC. c) Ammonia is passed over heated copper oxide. 2. The ionisation potential of an element A is greater than that of element B. a) How is the oxidising power of A likely to compare with that of B? b) How is the electronegativity of A likely to compare with that of B? [3] [3] c) State whether A is likely to be placed to the left or to the right of B in the periodic table? 3. Complete the chemical equation. a) Zn + CH3COOH b) C2H5Cl + hot.alcoholic.conc KOH 4. Justify the following statements: a) As one moves down a group, the reducing power of elements increases. b) Ethanol mixed with copper sulphate and pyridine. [2] [2] Question 04 1. Name the main metal present in the following alloys: [2] a) Duralumin b) Brass 2. Name the chemical formula for the following ore: [2] a) Cryolite. b) calamine. 3. Balu was given a salt X for analysis which was white in colour. On strong heating it produced a yellow residue when it is hot ad white when it is cold, release a colourless gas, and also a reddish-brown gas.. [3] a) Write the chemical equation. b) Which cation and anion was present in the sample given to Balu? c) write the equation taken place if above salt X was treated with excess of NaOH. 4. Identify the role of sulphuric acid and write the balanced equation. [3] o a) Converting ethanol into ethene at 170 C b) Aluminium reacts with fused sodium hydroxide. c) Laboratory preparation of nitric acid. Question 05 1. Identify the reactant and write the balanced equation for the following: Nitric acid reacts with compound Q to give a salt Calcium nitrate, water and carbon dioxide. [2] 2. Study the below picture and answer the questions [3] a) Write the chemical reaction takes place. b) Give reason. Sulphuric acid is not used to dry the gas. c) Why flask was tilted? 3. Write the balanced equation for the following. a) Conversion of sulphur dioxide into sulphur trioxide b) Di-bromo ethane treated with hot alcoholic KOH. c) Aluminium carbide reacts with water 4. Write the dot diagram for the following compounds. a) NaCl. b) Ammonium ion. [3] [2] Question 06 1. Prepare the following salts using suitable reagents and name the method of preparation. a) Zinc sulphate from zinc b) lead sulphate from lead carbonate 2. Identify the A,B,C,D And E n the following reactions: [2] [2] 3. Give reasons for the following: a) More reactive metals can reduced only by electrolytic reduction. b) Acetic acid is mano basic acid. c) During Hall Heroult s process anode has to be replace time to time. [3] 4. The following questions relate to manufacturing of nitric acid. a) Name the process. b) Write all the chemical equations involve. [3] Question 07 1. Siddaraju has solution X, Y and Z that has pH 2, 7 and 13 respectively. Which solution (write chemical equation) a) will liberate hydrogen sulphide gas when heated with sodium sulphide? b) will liberate ammonia gas when reacted with ammonium chloride? c) turns methyl orange into yellow? [3] 2. A gas cylinder contains 12 x 1024 molecules of oxygen gas. If Avogadro's number is 6 x 1023; [2] Calculate: i) the mass of oxygen present in the cylinder. ii) the volume of oxygen at S.T.P. present in the cylinder. [O=16]. 3. On analysis, a substance was found to contain C = 54.54%, H = 9.09%, O = 36.36% The vapour density of the substance is 44, calculate; a) it's empirical formula, and b) it's molecular formula. 3. Arrange the following according to the instructions i ) He, Li, K, Na (Increasing Ionisation Energy) ii) Na, K, Cl, Ar (Increasing atomic size) [3] [2] Question 08 1. How much calcium oxide is formed when 82 g. of calcium nitrate is heated.Also find the volume of nitrogen dioxide evolved : [2] 2Ca(NO3)2 2CaO + 4NO2 + O2 [Ca = 40, N = 14, O = 16] 2. Study the following compounds answer the following question. [4] a. Name the two compounds which are in same homologous series. b. How many isomers are there for compound F. c. Which compound freezes like ice when store below 17OC. d. Which compound is prepared by wurtz recation, write chemical equation. 3. Write the chemical reactions [4] a. Ammonium chloride reacts with sodium hydroxide b. Sodium carbonate reacts with dil nitric acid c. Sulhur dioxide gas passed to potassium dichromate solution. d. Sodium chloride reacts with conc. Sulphuric acid at <200OC.

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