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ICSE Class X Prelims 2023 : Chemistry (Chatrabhuj Narsee Memorial School (CNM), Mumbai)

7 pages, 95 questions, 20 questions with responses, 20 total responses,

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Indian Certificate of Secondary Education (ICSE), New Delhi

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C.NM.&N.D.PAREKH SCHOOL Krcelenee in Vaueatien Shri Vile Parle Kelavani Mandal's C.N.M. School & N.D. Parekh Pre-Primary School CLASS DATE Preliminary Examination 2022 23 TIME XX 12.01.2022 CHEMISTRY 2 hours MAX MARKS 80 Number of printed pages - 7 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 time given at the head of this paper is the time allowed for writing the answers. This paper comprises two sections: Section A and Section B Section A is compulsory Attempt any four questionsfrom Section B. The intended marks for questions or parts of questions are given in brackels [ } SECTION - A (Attempt all questions from this section.) Question 1 Choose the correct answers to the questions from the given option: [1S] Drying agent used to dry ammonia gas: i) (a) Concentrated Sulphuric acid (b) Calcium oxide (c) Phosphorus pentaoxide (d) Fused calcium chloride With reference to the variation of properties in the periodic table, which of the following statements is generally true? (a) Atomic size increases from left to right across a period ii) (b) lonization potential increases from left to right across a period (c) Electron affinity increases going down a group (d) Electronegativity increases going down a group Brass is an alloy of: ii) (a) Copper and tin (6) Copper and zinc (c) Zinc and lead (d) Lead and tin Std X-Chemistry Preliminary Examination 2022-2023 Page 1 of 7 iv) A compound having one lone pair of electrons: (a) Water (b) Methane (c) Ammonia (d) Hydrogen sulphide v) Dehydrated product obtained when cane sugar reacts with concentrated sulphuric acid: (a) C (b) CO (c) CO2 (d) C and CO Gas evolved when dilute vi) hydrochloric acid (a) Hydrogen gas (b) Chlorine gas (c) Hydrogen sulphide gas reacts with sodium sulphite: (d) Sulphur dioxide gas The hydroxide vii) (a) Fe(OH) which is soluble in excess of NaOH: (b) Fe(OH) (c) Zn(OH)2 (d) Cu(OH) vii) Substitution reactions are characteristic to: (a) Alkanes (b) Alkenes (c) Alkynes (d) None of these ix) If empirical formula of an organic compound is CH, then its molecular formula is (a) CH4 (b) CaH4 (c) CaH6 (d) CsH6 Oxidised product formed when sulphur reacts with hot and concentrated nitric acid x) (a) Sulphur dioxide (b) Nitrogen dioxide (c) Water (d) Sulphuric acid xi) Common name of ore, zinc oxide: (a) Zincite (b) Calamine (c) Zinc blende (d) Cryolite Std X Chemistry Preliminary Examination 2022-2023 Page 2 of 7 xii) The IUPAC (a) Propyne name of ethylene: (b) Propane (c) Ethene (d) Ethyne xii) Electroysis of molten lead bromide is carried out in: (a) Silica crucible (b) Aluminum vessel (c) Clay cerucible (d) Glass vessel Ostwald's process is the name of industrial preparation of: Xiv) (a) Sulphurie acid (b) Ammonia (c) Nitric acid (d) Hydrochloride gas If the RMM of water is 18, thcn its vapour density is Xv) (a) 9 (b) 18 (c) 27 (d) 3 Question2 (i) Identify the following a) The [51 term: electrode connected to the b) The tendency of an negative terminal of the combined in atom to attract electrons to itself when chloride c) Special arrangement for dissolving hydrogen d) The name of the process by which the bauxite one c) The bond formed by transfer of element to (ii) an Select the correct a) battery. or more gas in a compound. water. is concentrated. ore electrons from the atom of an clectropositive electronegative element. answer Ammonia and water from the bracket to are complete the following statements: polar/non-polar) covalent examples of compounds. b) (graphite/gas carbon). alumina is The anode used in extraction from c) Gas released when manganese dioxide reacts with concentrated HCI is (oxygen gas/chlorine gas) d) An acid having basicity one is e) (carbonic acid/acetic acid) is state that docs not conduct electricity The non-polar covalent compound in gaseous (carbon tetrachloride/ammonia) Std X-Chemistry Preliminary Examination - 2022-20233 Page 3 of7 111) The diagram shows an cxperiment set up for the laboratory preparation of nitric acid. Cold water Nitric acid vapours Conc. Sulphunc acid Na.NOs er KNOs condensed Nitric acid a) Write balanced equation for the reaction. b) State why the temperature of the reacting mixture is not allowed to rise above 200 C? c) Why a yellow colour appears in concentrated nitric acid when left standing in an ordinary glass bottle? d) What is the special feature of apparatus used? e) Concentrated HCl is not used instead of concentrated H2SO4, in the above preparation. Why? (iv) A compound is found to possess carbon 40%, Hlydrogen = = 6.7% and Oxygen = 53.3%. Its molecular mass is 60. Find the molecular formula of the compound. S (Atomicmass: C 12, H 1,0= 16) (v) A) Draw the structural formula of: a) Butanal b)propanoicacid c) 1,2-dibromoethane B) Give the IUPAC name of the following organic compounds: a) H H H H C-H C=C H H b) H c-H H H Std X-Chemistry Preliminary OH H Examination - 2022-2023 Page 4 of 7 Section B (Attempt any four questions) Question3 ) Define 2 a) Catenation. b) Gay Lussac's law of combining volume. (ii) Distinguish between the following pairs of compounds: 2 a) Iron (11) sulphate and Iron (1) sulphate. b) Sodium carbonate and sodium sulphite ii) Write balanced chemical equation for the following: [31 a) Prepare methane from methyl iodide. b) Ethyne preparation from calcium carbide. c)Lead nitrate reacts with dilutehydrochloric acid. (3 iv) Answer the following questions: a) What is meant by vapour density? b) How is Hydrogen chloride gas collected? c) State any two uses of duralumin. Question 4 ) Give reason with respect to the electrolytic reduction of pure alumina to pure aluminium: (2 a) Anodes are continuously replaced during the process. b) Cryolite is added in the mixture of electrolye. Gi) Solution A has a pH of 14, Solution B has a pH ofS and solution C has a pH of 3. 21 a) Which solution is a strong acid? b) Which solution contains molecules as well as ions? ii) Solve 150 cm of hydrogen and 100 cm' of oxygen are mixed and ignited. a) What volume of oxygen remains unreacted? vapour is formed, if all gases b) What volume of water (iv) State your observation for the a) Concentrated sulphuric following are measured at 100" C. reactions: 13 acid is added to copper. of b) Oxidation of ammonia in the presence platinum. solution. c) Dilute hydrochloric acid is added to copper sulphide Std X- Chemistry Preliminary Examination 2022-2023 Page 5 of 7 Question 5 (2 () ldentify the functional group in the following organic compounds: a) CHOH b) CaH:CHo 2 (ii) Complete the following equations: a) NH3 + Cl2 (excess) b) Cu+ Cone. HNOs (ii) Identify the following: 31 a) The non-metal in period 2 having valency 1. b) Catalyst used in Haber's process. c)Third member of alkene. iv) During the clectroplating of metal with silver: a) Write the reaction at the anode. b) State what you observe at the cathode. e) Name the electrolyte used. Question 6 i) Draw the electron dot structure for the following: [21 a) NH4* b) CCl4 ii) Name the following: [2 a) Property of sulphuric acid shown by the reaction of concentrated sulphuric acid with carbon. b) A salt formed by incomplete neutralization of an acid by a base. (ii) Write balanced chemical equation for the following: 3 a) preparation of ethene from ethanol. b) Sugar with concentrated sulphuric acid. c) Preparation of ammonia from aluminium nitride. (iv) Arrange the following as per the instruction given in the bracket: 3 a) C, Li, F, N, O (increasing order of electronegativity) b) Na, Li, K, Cs (increasing order of ionization energy) c)Mg, CI, S, Na, Si (decreasing order of atomic size) Question 7 ) Define isomers. Give the IUPAC name of the isomer CaHio which has a branched chain. Std X-Chemistry Preliminary Examination - 2022-2023 [2 Page 6 of 7 (ii) Observe the diagram and answer the following: 2 Hycdrogen chlotide Water Dropper Water blue itus a) What property of hydrogen chloride gas does this experiment demonstrate? b) Identify the colour of fountain formed. (iin) Match the atomic number 2, 5, 20 with each of the following: 131 a) An element belonging to group 13. b) A metal of valency 2 c) A rare element. (iv) Select the correct answer from the bracket to complete the following statements: a) The basicity of phosphoric acid is b) Zinc blende is (1/3) (ZnO/ZnS) (hydration/hydrogenation) c) Conversion of ethene to ethane is an example of Question 8 21 (i) Identify the cations present in each of the following compounds: a) NaOH solution when added to the solution 'A' gives a reddish brown precipitate. b) NHOH solution when added to the solution 'B' is added in minimum quantity first and then in excess. A white precipitate is formed which dissolves in excess to form a clear solution. (11) Aqueous sulphate contains Ni" solution of nickel and SO4 ions. a) Which ion moves towards the anode? b) What happens at the anode? (iii) State your observation for the following reaction: a) Ammonia reacts with b) Lead nitrate reacts c) Iron(I) sulphide (iv) excess Write balanced chemical (3 of chlorine. with dilute reacts 2 hydrochloric with dilute equation acid. sulphuric acid. for the following: a) Methane reacts with excess of oxygen. b) Ethene reacts with chlorine. c) Catalytic hydrogenation of ethyne. Std X Chemistry Preliminary Examination - 2022-2023 Page 7 of 7

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