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ICSE Class X Question Bank 2026 : Physics

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GEMS Modern Academy, Dubai
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FINAL MOCK EXAM - CHEMISTRY-2024 Time 2 hours Marks 80 SECTION 1 (40 MARKS) Question 1 (15) Choose the correct answer from options given below 1. If the empirical mass of the formula SR is 10 and vapour density is 15, then molecular formula is a. S6R3 b. S3R6 c. S2R d. S3R3 2. The spectator ion in the electrolyte when acidified water is electrolysed is a. Hydrogen ion b. Sulphate ion c. Hydroxide ion d. Water molecules 3. Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of a. Dehydration b. Dehydrogenation c. Dehydrohalogenation d. Dehalogenation 4. Which among the following is not an alloy of copper a. Brass b. Bronze c. Duralumin d. Solder 5. Nessler s reagent is used to confirm the presence of which ion a. Sulphide b. Nitrate c. Ammonium d. Chloride 6. The most nonmetallic element in the periodic table a. Nitrogen b. Chlorine c. Fluorine d. Oxygen 7. The number of CH bonds in pentane molecule a. 11 b. 10 c. 16 d. 12 8. Hot concentrated nitric acid oxidises sulphur to a. Nitrogen dioxide b. Sulphur dioxide c. Sulphuric acid d. Sulphurous acid 9. The constituent elements present in ore siderite is a. Fe, C and O b. Fe and O c. Zn, C and O d. None of the above 10. The organic compound which undergoes substitution reaction is a. C2H2 b. C2H5 c. C10H18 d. C2H6 11. The acid which will not form an acid salt a. Sulphuric acid b. Phosphoric acid c. Acetic acid d. Carbonic acid 12. The trivial name of 1-butyne a. Methyl acetylene b. Dimethyl acetylene c. Ethyl acetylene d. 1-butylene 13. Which is the correct statement in the electrolysis of silver a. Oxidising electrode diminishes in mass b. The article to be electroplated serves as anode c. Sulphate and hydroxide ions are discharged at the anode d. Crystals of sodium argentocyanide is used as an electrolyte 14. On performing flame test, salt P produces a lilac flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution, then P is a. Potassium chloride b. Sodium chloride c. Potassium sulphate d. Potassium carbonate 15. If pH solution is added to distilled water, then the colour will be a. Violet b. Red c. Green d. yellow Question 2 A. Write IUPAC names of the following (5) Draw the structural formula of the following c. 2,2-dimethylpentanoic acid d. 3-methylbutan-2-ol e. 4-iodopent-2-ene B. Name the following (5) a. Product formed when cold water is added to calcium carbide b. Fourth member of aldehydes c. Soluble salt of aluminium formed when bauxite reacts with conc. NaOH. d. Monovalent nonmetal present in fluorspar e. A mixture of sodium hydroxide and calcium oxide C. State one relevant observation for each of the following reactions (5) a. A paper soaked in potassium dichromate solution is introduced into a gas jar of hydrogen sulphide b. Aluminium metal is boiled with potassium hydroxide solution c. When a mixture of copper, sodium nitrate and conc. Sulphuric acid are heated. d. Ammonia gas is burnt in air e. Ethanoic acid is heated with ethanol in presence of con H2SO4. D. Give balanced equations for the following reactions a. Action of dil. Hydrochloric acid on copper oxide b. Action of alcholic potassium hydroxide on ethylene dibromide c. Potassium nitrate is heated strongly d. Copper reacts with hot and dilute nitric acid e. Conc. Sulphuric acid and nitre are heated above 200 C. (5) E. Give reasons for the following: a. Aluminium is used in thermite welding. b. The atomic size of sodium is more than that of sulphur c. Zinc is used in alloys like brass, bronze, etc. d. Electrolytic reduction of alumina is a continuous process. e. Alkenes burn with a yellow sooty flame. (5) SECTION II (40 marks) Question 3 (3 + 2 + 3 + 2) a. A compound weighing 1.3 g on analysis gave the following composition. Al = 0.2675 g, P =0.3505 g, O = 0.682 g. If the molecular weight of the compound is 122, calculate the molecular formula of the compound. (Al = 27, P = 31, O = 16) b. Give reasons i. Haber s process is extremely complicated process. ii. Extra care should be taken while handling nitric acid in the laboratory. c. A direct current is passed through a voltameter containing acidulated water as an electrolyte and platinum electrodes. Answer the following questions i. Why is direct current and not alternating current used ii. Why are platinum electrodes used iii. State the ionic reaction taking place at anode d. Give chemical test to distinguish between i. Zinc chloride and zinc nitrate ii. Chlorine and hydrogen chloride Question 4 (2 + 2 + 3 + 3) a. Copy and complete the following table which refers to the conversion of ions to neutral particles. Conversion Bromide ion to bromine molecule Oxidation/reduction (i) Ionic equation (ii) Copper (II) ion to copper (iii) (iv) b. Given 2 C2H6 + 7O2 => 4 CO2 + 6 H2O 2000 cc of O2 was burnt with 400 cc of ethane. Calculate the volume of CO2 formed and volume of unused O2. c. The table below shows part of periodic table which have letters not symbols of elements concerned. i. ii. iii. Which element has electron affinity zero? Which is the most reactive metal? Which is the most reactive non-metal? d. Write balanced equations for following conversions i. Methane from sodium acetate ii. Ethene from bromoethane iii. Ethane from ethanol. Question 5 (5 + 2 + 3) a. The preparation of salt X which forms dirty green precipitate when NH4OH is added to its solution is given below Take Y in a beaker and add iron filings. Heat slowly until efferescence ceases and no more Fe dissolves. Filter the contents of the beaker to remove residual iron filing along with any impurities. Evaporate the filtrate to the point of crystallisation. Cool the hot saturated solution. The salt X crystallises out. Filter and dry the crystals. i. ii. iii. iv. v. Identify Y State the molecular formula of X State the method of preparation (type of chemical reaction) of X. The crystals of X are (soluble/insoluble) in water. Give example of another salt that can be prepared by this method. b. Calculate the percentage of carbon in 55% pure sample of calcium carbonate (Ca = 40, C = 12, O= 16). c. Solution of X is a strong acid, solution Y is a weak acid and solute Z is a strong alkali. i. Which of the above will give a white precipitate with calcium nitrate solution? ii. Which of it would be solution of acetic acid? iii. Which of it would be a solution of dilute hydrochloric acid? Question 6 (3 + 2 + 5) a. Arrange the following as per instructions given i. Na, S, Al, Cl (increasing order of ionisation potential) ii. Zn2+, Na+, Cu2+, Ag+ (order of preference of discharge at the electrode) iii. Br, F, Cl, I (decreasing order of atomic radius) b. Study the reaction below (K = 39, O = 16, Cl = 35.5) 2 KClO3 2 KCl + 3 O2 i. Calculate the mass of potassium chlorate required to produce 6.72 L of oxygen at NTP. ii. Calculate the number of molecules of oxygen present in the above volume. c. The questions below relate to sulphuric acid i. Give the summary of reactions during preparation of sulphuric acid from iron pyrites by contact process (2) ii. Give two step reaction which shows acidic property of sulphuric acid (1). iii. Sulphuric acid is the preferred acid in many reactions compared to nitric and HCl acid. Explain (2)

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