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ICSE Class X Sample / Model Paper 2023 : Chemistry

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Arabinda Kumar Das
St. Xavier's Institution (SXI), Panihati, Kolkata

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STEWART SCHOOL, BHUBANESWAR SCREENING EXAMINATION - 2023-24 CHEMISTRY Maximum Marks :80 Time allowed : Two hours 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 (Attempt all questions from this section) Question.1. Choose the correct answers to the questions from the given options. (i) Among the period 3 elements, the element which has high electron affinity is (a) sodium (ii) [ 15 ] (b) chlorine (c) fluorine (d) Argon The ratio between the number of molecules in 2gm of hydrogen and 32gm of oxygen is (a) 1 : 2 (iii) (c) 1 : 01 (d) 1.01 : 1 (c) ZnO (d) Nacl Which of the following is not a base? (a) KOH (iv) (b) 1 : 1 (b) Al (OH ) 3 One molecule of aluminium hydroxide will require how many molecules of dil.HCl for complete neutralization. (a) 1 (v) (vi) (vii) (b) 2 (c) 3 (d) 4 Which of the following elements will form acidic oxide? (a) sodium (b) magnesium (c) sulphur (d) None of these Which of the following increases along the period? (a) Number of valence electrons. (b) Atomic size (c) Electropositive character (d) all of these The molecular mass of a compound is 88 amu having empirical formula of C 2 H 4 O . Its molecular formula will be (a) C2H4O2 (b) C4H8O2 (c) C8H4O2 (d) C2H8O2 Page | 1 (viii) Which of the following contains more molecules? (a) 1 gm of CO2 (ix) (c) 1 gm H2 (d) 1 gm CH4 (c) C3H8 (d) C3H9 Which of the following have triple bond? (a) C3H4 (x) (b) 1 gm N2 (b) C2H4 The difference in molecular weight of two consecutive member of a homologues series is (a) 15 (xi) (b) 14 (d) 16 How many unshared pair of electrons are present in water molecule? (a) one (xii) (c) 8 (b) zero (c) two (d) None of these. (c) butane (d) None of these The second alkene is (a) ethane (b) propene (xiii) The hydroxide which is soluble in excess of NaOH is (a) Zn(OH)2 (b) Fe(OH)2 (c) Fe(OH)3 (d) None of these (xiv) The particles present in strong electrolyte are: (xv) (a) only molecules (b) mainly ions (c) ions and molecules (d) only atoms The temperature at which catalytic oxidation of ammonia is carried out: (a) 2000C (b) 3000C (c) 5000C (d) 8000C Question.2. (i) The setup show below is that the fountain experiment with hydrogen chloride gas in the flask. [ 5 ] The fountain starts when a few drops of water from the dropper are introduced into the flask. Instead of the drops of water, Pooja started the fountain by introducing a few drops of Sodium hydroxide into the flask. Page | 2 (a) Explain why the litmus solution gets sucked up when Sodium hydroxide is used. (b) What will be the colour of the fountain when Sodium hydroxide is used? Justify your answer. (c) If instead of HCl gas, ammonia gas is filled in the flask and water is introduced from the dropper, will there be a different observation? Justify your answer. (ii) Match the following column A with column B [5] Column A Column B (a) Metal (1) Cl (b) Cation (2) Yellow (c) Non-metal (3) (d) anion (4) good conductor of heat (e) Iron(III) chloride (5) bad conductor of heat K SECTION - B (Attempt any four questions from this Section.) Question.3. i) ii) Name the metal which can be extracted from the following ores: (a) Hematite (b) Calamine [2] Define. [2] (a) co-ordinate bond iii) (b) Gay lussac s law Write down the I-U-P-AC name of the following compounds. [3] Page | 3 (iv) Give reason. [3] (a) Why group 1 elements are called alkali metals? (b) Why electrovalent compounds have high melting point and boiling points. (c) Why acetic acid is mona basic acid? Question.4. (i) (ii) Give one difference between (a) sodium atom and sodium ion (b) cation and anion. [2] State the colour of the precipitate. [2] (a) when caustic soda solution is added Ferrous sulphate. (b) When caustic soda solution is added to lead nitrate. (iii) An element was atomic number 14. State (a) the period to which it belongs. (b) the number of valence elements. (c) whether it is a (iv) metal or non metal. [3] Arrange the following elements as directed. [3] (a) Ar, He, Ne ( In decreasing order of electron shells) (b) Cl , S , Al , K (Increasing order of ionisation potential) (c) Mg, Ca, Sr, Ba (increasing order of electron affinity) Question.5. (i) Give reason. (a) [2] A black spongy mass is formed when concentrated sulphuric acid is added to sugar. (b) Pure nitric acid take on a yellowish brown colour when exposed to light, Why? (ii) Name the gas evolved: [2] (a) The gas produced when excess ammonia reacts with chlorine. (b) The gas produced when copper reacts with concentrated nitric acid. iii) How will you bring about the following conversion. (a) Methane to methyl chloride. (b) Ethene to ethane (c) ethyl chloride to ethanol [3] Page | 4 (iv) For each of the substance listed below, described the role played in the extraction of aluminum. (a) cryolite (b) sodium hydroxide [3] (c) Fluorspar Question.6. (i) Define the following. (a) catenation (ii) [2] (b) vapour density Which property of sulphuric acid is used in the following: [2] (a) Charring of sugar with hot concentrated acid. (b) As a source of hydrogen when treated with in dilute form with metals like zinc. (iii) The following question are based on the preparation of ammonia gas in the laboratory. (a) [3] Explain why ammonium nitrate is not used in the preparation of ammonia. (iv) (b) How is ammonia gas collected? (c) Give the name of a hydride of nitrogen. During the electrolysis of copper(II) sulphate solution using platinum as cathode and carbon as anode. [3] (a) What do you observe at the cathode? (b) What change is noticed in the electrolyte? (c) Write the reaction at the anode. (a) What is the basicity of an acid. (b) What are the particles present in a non-electrolyte? Question.7. (i) (ii) (iii) What should be the physical state of lead bromide if it si to conduct electricity? [2] Predict the type of bonding in the following molecules: [3] (a) Methane (iv) [2] (b) Magnesium Chloride (c) Nitrogen A gases hydrocarbon contains 82.76 of carbon. Given that its vapour density is 29, Find its molecular formula. [ C=12, H=1] [3] Question.8. (i) Calculate the volume of 320gm of SO2 at S.T.P. ( Atomic mass of S=32 and O=16 ) [2] Page | 5 (ii) Calculate the volume of propane burnt for every 200cm3 of oxygen used in the reaction. [2] C3 H 8 5O2 3CO2 4 H 2 O (iii) A colourless gas G fumes strongly in the air. The gas gives dense white fumes when a glass rod dipped in ammonia solution is held near the gas. Answer the following questions: (iv) [3] a) Name the gas G. b) Why does the gas G fumes strongly in air. c) Name two chemicals used in the preparation of the gas G a) Name the alloy of zinc and copper. b) Name the zinc compound obtained by roasting of zinc blende. c) Name the substance must be added to sidium chloride to obtain [3] hydrogen chloride gas. Page | 6

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