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ICSE Class X Sample / Model Paper 2024 : Chemistry

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ICSE 10TH CHEMISTRY SAMPLE PAPER 3 PAGE 1 Sample Paper 3 ICSE Class X 2023-24 Chemistry Science Paper - 2 Time: 2 Hours Max. Marks: 80 General Instructions: 1. Answer to this Paper must be written on the paper provided separately. 2. You will not be allowed to write during first 15 minutes. 3. This time is to be spent in reading the question paper. 4. The time given at the head of this Paper is the time allowed for writing the answers. 5. Section A is compulsory. Attempt any four questions from Section B. 6. The intended marks for questions or parts of questions are given in brackets [ ]. SECTION - A (Attempt all questions from this Section.) QUESTION 1. Choose the correct answers to the questions from the given options. [15] (Do not copy the questions, write the correct answer only.) (i) (ii) Which of the following ions will readily discharge at the anode during the electrolysis of acidulated water? (b) SO24(a) OH(c) Cl- (d) H+ Which of the following is a tribasic acid? (a) H2SO4 (b) Al(OH)3 (c) H3PO4 (d) Ca(OH)2 (iii) Alkaline earth metals have the same (a) number of valence electrons (c) metallic property (b) number of shells (d) ionisation potential (iv) Vinegar contains ............... acid. (a) Phenol (c) Sulphuric (b) Hydrochloric (d) Acetic ICSE 10TH CHEMISTRY (v) SAMPLE PAPER 3 PAGE 2 Which of the following properties do not match with elements of the halogen family? (a) They have seven electrons in their valence shell. (b) They are metallic in nature. (c) They are highly chemically reactive. (d) They are diatomic in their molecular form. (vi) During electrolysis of sodium chloride the gas released at anode is : (a) Chlorine (c) Oxygen (b) Hydrogen (d) None of these (vii) NaHSO3 is an example of which type of salts? (a) Complex salts (c) Normal salts (b) Basic salts (d) Acidic salts (viii) Across a period, the ionization potential ............... (a) decreases (c) remains the same (b) increases (d) none of the above (ix) Which acid is used for brown ring test ? (a) Sulphuric acid (c) Hydrochloric acid (x) (b) Carbonic acid (d) Sulphurous acid Elements in a period, all have the same number of ............... in their atoms. (a) electron shells (b) valence electrons (c) valency (d) None of the above (xi) How many lone pair(s) involved in the formation of coordinate bond(s) in nitric acid? (a) 4 (c) 3 (b) 2 (d) 1 (xii) Compounds of carbon and hydrogen are known as (a) Hydrocarbons (c) Catenated compounds (b) Organic compounds (d) None of above (xiii) If relative molecular mass of butane (C4H10) is, 58 then its vapour density will be (a) 58 (c) 32 (b) 29 (d) 16 (xiv) The ratio by volume of Nitrogen and Hydrogen in Haber s process is (a) 1 : 3 (c) 3 : 1 (b) 4 : 2 (d) 2 : 4 (xv) In a group, the larger the atomic size of an element, the ............... metallic is the element. (a) more (c) less (b) same (d) more or less ICSE 10TH CHEMISTRY SAMPLE PAPER 3 PAGE 3 QUESTION 2. (i) (a) State what do you observe when : neutral litmus solution is added to an alkaline solution. [5] (b) Name (formula is not acceptable) the gas produced in the following reaction : Warming ammonium sulphate with sodium hydroxide solution. (c) Write the equation for : the preparation of ammonia from ammonium chloride and calcium hydroxide. (d) What are the products formed when ammonia is oxidised with copper oxide? Also give the balanced equation. (ii) Match the following column A with Column B: Column A [5] Column B A. Acid salt (i) Sodium potassium carbonate B. Mixed salt (ii) Alum C. Complex salt (iii) Sodium carbonate D. Double salt (iv) Sodium zincate E. Normal salt (v) Sodium hydrogen carbonate (iii) Complete the following by choosing the correct answers from the bracket: (a) (b) (c) (d) (e) [5] In Period 3, the most metallic element is______. (sodium/magnesium/aluminium) The basicity of Acetic Acid is_____(3, 1, 4) Transmission wires are made of aluminium, since aluminium is______. (corrosion resistant/a good conductor of heat/a good conductor of electricity). Addition of sulphuric acid to zinc sulphide flakes release a gas With ----------- small. Quick lime is not used to dry HCl gas because it is _____ (alkaline, acidic, neutral) (iv) Identify the following: (a) (b) (c) (d) (e) (v) [5] The tendency of an atom to attract electrons towards itself when combined in a covalent compound. The number of shells in the third period. The most electronegative element in the third period. A non-metal which has three electrons in the outermost shell. The gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution. (a) Distinguish between the saturated hydrocarbon ethane and the unsaturated hydrocarbon ethene by drawing their structural formulae. [5] (b) Addition reactions and substitution reactions are type of organic reactions. Which type of reaction is shown by : (1) ethane (2) ethene (c) Write the equation for the complete combustion of ethane. (d) (1) Why is pure acetic acid known as glacial acetic acid ? (2) What type of compound is formed by the reaction between acetic acid and an alcohol ? ICSE 10TH CHEMISTRY SAMPLE PAPER 3 PAGE 4 SECTION - B (Attempt any four questions.) QUESTION 3. (i) What is the molecular formula of alcohol, which is derived from pentane ? (ii) What property of sulphuric acid is shown by the reactant of concentrated sulphuric acid when heated with [2] (a) Potassium nitrate (b) Carbon (iii) Consider the following elements : [2] [3] Ca, O, Ar, S, Be, He Which of the above elements would you expect to be (a) very stable. (b) in group IIA of the periodic table. (c) in group VIA of the periodic table. (iv) Sulphuric acid can be used to prepare a number of gases in the laboratory. Write balanced equations for reactions in which the following gases are obtained using dilute sulphuric acid as one of the reactants. [3] (a) Hydrogen (b) Carbon dioxide (c) Sulphur dioxide QUESTION 4. (i) The following questions are related to Iron: (a) Name the acid with which iron is rendered passive. (b) Name an alloy of Iron and Carbon. (ii) Determine the empirical formula of the compound whose composition by mass is : 42% nitrogen, 48% oxygen and 9% hydrogen. [2] [H = 1, N = 14, O = 16] (iii) (a) Name the substance used for drying ammonia. [2] [3] (b) Write an equation to illustrate the reducing nature of ammonia. (c) With reference to Haber s process for the preparation for ammonia, write the equation and the condition required. (iv) Name the gas evolved when the following mixtures are heated: (a) Calcium hydroxide and Ammonium Chloride. (b) Sodium Nitrite and Ammonium Chloride. (c) This gas is used as a reducing agent in reducing copper oxide to copper. [3] ICSE 10TH CHEMISTRY SAMPLE PAPER 3 PAGE 5 QUESTION 5. (i) Give four uses of ammonia. [2] (ii) Choose the most appropriate answer from the following list of oxides which fit the description. Each answer may be used only once : [2] [SO2, SiO2, Al2O3, MgO, CO, Na2O] (a) A basic oxide. (b) An oxide which dissolves in water forming an acid. (c) An amphoteric oxide. (d) A covalent oxide of a metalloid. (iii) Explain the following: [3] (a) Dilute nitric acid is generally considered a typical acid except for its reaction with metals. (b) The reaction of dilute nitric acid with copper. (c) The yellow colour that appears in concentrated nitric acid when it is left standing in an ordinary glass bottle. (iv) Write the formulae of the products in the following reactions : [3] (a) reaction of sodium with ethanol; (b) reaction of alkaline potassium permagnate solution with ethanol; (c) reaction of chromic anhydride with ethanol. QUESTION 6. (i) What is the mass in grams of 1 mole of (a) Hydrogen gas (H2) (b) Ammonia gas (NH3) [2] (ii) (a) State your observation with an equation on mixing a solution of CaCl2 with a solution [2] of Na2CO3. (b) Give the name and formula of acid salt which gives sodium ions and sulphate ions. (iii) Mr. Ramu wants to electroplate his key chain with nickel to prevent rusting. For this electroplating : (a) Name the electrolyte. (b) Name the cathode. (c) Name the anode. [3] (iv) Write down the words or phrases from the brackets that will correctly fill in the blanks in the (a) (b) (c) following sentences : [3] Pure water consists almost entirely of_____ (ions/molecules). We can expect that pure water_____(will/will not) normally conduct electricity. The anode used in extraction of aluminium is______. [carbon rods/gas carbon/platinum] ICSE 10TH CHEMISTRY SAMPLE PAPER 3 PAGE 6 QUESTION 7. (i) Write balanced chemical equations: (a) Burning of Ethene in sufficient supply of air or Oxygen. (b) Burning of Ethyne in sufficient supply of air or Oxygen. (c) Calcium carbide is reacted with water. [3] (ii) Solution A is a sodium hydroxide solution. Solution B is a weak acid. Solution C is dilute sulphuric acid. Which solution will ? [3] (a) liberate sulphur dioxide from sodium sulphite. (b) give a white precipitate with zinc sulphate solution. (c) contain solute molecules and ions. (iii) (a) Write a balanced equation for the reaction of sulphur with hot concentrated nitric acid. [4] (b) Write the equation for the reaction of dilute nitric acid with copper. (c) Account for the yellow colour that appears when concentrated nitric acid is left standing in an ordinary glass bottle. (d) Dilute nitric acid is considered a typical acid except for its reaction with metals. In what way is dilute nitric acid different from other acids when it reacts with metals ? QUESTION 8. (i) State one observation for each of the following: [2] (a) Excess ammonium hydroxide solution is added to lead nitrate solution. (b) Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess. (ii) Draw an electron dot diagram to show the structure of hydroponic ion. State the type of bonding present in it. [2] (iii) Give a chemical test to distinguish between the following pairs of chemicals: [3] (a) Lead nitrate solution and Zinc nitrate solution. (b) Sodium chloride solution and Sodium nitrate solution. (iv) Element X is a metal with a valency of 2, Y is a non-metal with a valency of 3. [3] (a) Write an equation to show how Y forms an ion? (b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound. (c) To which group does this metal X belongs to? *******

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