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ICSE Prelims 2017 : Chemistry (Smt. Sulochanadevi Singhania School, Thane)

6 pages, 90 questions, 86 questions with responses, 172 total responses,

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SMT. SULOCHANADEVI SINGHANIA SCHOOL, THANE STD X SUB CHEMISTRY EXAM PRELIM II MARKS 80 TIME 2 Hrs Section I Attempt all questions from this section Question 1 A. Select the correct answers from the choices given: [5] i) German silver is an alloy of a) Cu + Zn b) Cu + Sn c) Cu + Zn + Ni d) Cu + Zn + Sn ii) A compound having one lone pair electron is a) Water b) Methane c) Ammonia d) Hydrogen sulphide iii) Sal ammoniac has the formula a) (NH4)2SO4 b) (NH4)2CO3 c) NH4Cl d) NH4OH iv) A nitrate which on heating decrepitates and produces yellow residue which fuses with the sides of the test-tube. a) Lead nitrate b) Silver nitrate c) Zinc nitrate d) Mercuric nitrate v) A reagent used to distinguish between alkanes and alkynes is a) Bromine water b) Carbon tetrachloride c) Zinc nitrate d) Mercuric nitrate B. Name the gas evolved in each case: i) ii) iii) iv) v) [5] The gas produced by the action of concentrated sulphuric acid on potassium nitrate. The gas produced by action of very dilute nitric acid on manganese. The gas produced on heating potassium nitrate. The gas evolved when conc .hydrochloric acid is oxidized by potassium dichromate. The gas that burns in oxygen with a green flame. C. State relevant observations in each of the following cases: i) A rod dipped in Ammonium hydroxide is brought near jar of HCl gas. ii) A few drops of conc sulphuric acid is added to blue vitriol. [5] iii) Ammonium nitrate is strongly heated. iv) Copper carbonate is heated strongly. v) A solution of silver nitrate reacts with dil HCl and the product formed is treated with excess ammonium hydroxide. D. A monovalent element P is burnt in oxygen and the product formed on combustion is soluble in water. The solution of the product in water is tested with litmus solution. Write down suitable word/words to correctly complete the sentence. [4] i) If P is metal then litmus solution will turn_________. ii) The litmus solution used above is _________________ type of indicator. iii) If P is an active metal then _________ gas will be evolved when P reacts with dil. HCl iv) If P is an active metal then its oxide on dissolving in water will form _______solution. E. Circle the odd one out with proper reason: [2] i) HNO3, H3PO4, HCl, H2SO4 ii) Ca(OH)2, Cu(OH)2, KOH, Zn(OH)2 F. write fully balanced equations for the following: [6] i) Action of dilute hydrochloric acid with sodium thiosulphate. ii) Action of hot conc. Sodium hydroxide on zinc. iii) Burning of zinc blende in air. iv) Burning of ammonia in the atmosphere of oxygen. v) Oxidation of carbon with conc. Nitric acid. vi) Excess ammonia is treated with chlorine gas. G. The questions (i) to (v) refer to the following solutions listed from A to E. A. Potassium hydroxide solution B. Dilute hydrochloric acid C. Iron (III) sulphate solution D. Lead acetate solution E. Sodium sulphite [5] i) Which solution will liberate sulphur dioxide gas on treating with dilute sulphuric acid? ii) Which solution is likely to have pH above 12? iii) Which solution will give black ppt when hydrogen sulphide gas is passed through it? iv) ____________gives a reddish brown ppt when treated with sodium hydroxide solution. v) Which solution will liberate hydrogen on boiling with aluminium powder? H. Answer the following questions: i) State Gay-Lussac s law of combining volume. [1] ii) How is the molecular mass related to vapour density? Calculate the vapour density of Propane gas? (C=12, H=1) [2] iii) 5.6 dm3 of carbon dioxide is formed at s.t.p on the complete combustion of ethyne gas. What is the volume of ethyne gas used up at the same time? [2] 2C2H2(g) + 5O2(g) 4CO2 + H2O(l) I. Give a chemical test to distinguish between the following: [5] i) Sodium chloride solution and Sodium nitrate solution. ii) Hydrogen chloride gas and Carbon dioxide gas. iii) Potassium chloride and Sodium chloride. iv) Potassium sulphide and Potassium sulphate v) Ammonium hydroxide and Sodium hydroxide solution. Section II Attempt any four questions from this section Question 2 (a) Write the equations for the following laboratory preparations: (i) Ethyne from calcium carbide. (ii) Ethanol from alkyl halide. (iii) Ethene from ethanol. (iv) Methane from sodium acetate. (v) Ethyl acetate from acetic acid. [5] (b) Give the structural formula of: (i) Tetrachloromethane [3] (ii) 2,2-dimethyl butane (iii) Acetone (c) Answer the following [2] (i) What is meant by denatured alcohol? (ii) What is glacial acetic acid? Question 3 (a) Recall industrial method of preparation of Nitric acid and answer the following:[3] (i) Name of the process. (ii) Write the reaction taking place in the absorption tower. (iii) Concentrated acid after storing for a prolonged period of time turns yellowish brown. Why? (b) Following questions are related to extraction of aluminium: [7] (i) The ore from which aluminium is extracted and the name of the process. (ii) Why is conc.NaOH used in the above process? (iii) Name other substance added to electrolytic mixture which contains aluminium? (iv) Write the electrode reaction taking place at the cathode and anode respectively. (v) Which element is the anode made up of? (vi) The anodes are replaced periodically. Explain why? Question 4 (a) Choosing the substance from the given list below, write balanced equation for the reactions which would be used in the laboratory to obtain the following salts: [5] Dilute hydrochloric acid Copper Copper(II) carbonate Chlorine Hydrogen sulphide Iron Sodium chloride Sulphur Potassium Ammonium carbonate Lead nitrate (i) Lead carbonate (ii) Ammonium Chloride (iii) Copper(II) chloride (iv) Iron(II) chloride (v) Iron(II) sulphide (b) An article is to electroplated with Nickel- [5] (i) Write the electrode reaction taking place at the cathode and anode (ii) At which electrode will oxidation take place? (iii) Name the electrolyte used. (iv) Mention two conditions that should be maintained for smooth and thin electroplating. Question 5 (a) Write the property shown by sulphuric acid in the reaction mentioned below : (i) KNO3 + H2SO4 [3] KHSO4 + HNO3 (ii) CuO + H2SO4 CuSO4 (iii) S 3SO2 + 2H2O + 2H2SO4 + H2O (b) Solve: (i) The percentage composition of sodium phosphate as determined by analysis is 42.1% sodium, 18.9% phosphorous and 39% oxygen. Find the empirical formula of the compound.(Na=23, P=31,O=16) [3] (ii) The equation for the burning of octane is: 2C8H18 + 25O2 16CO2 + 18H2O A) How many moles of carbon dioxide are produced when one mole of octane burns? B) What volume, at stp, is occupied by the number of moles determined above? C) If the relative molecular mass of carbon dioxide is 44, what is the mass of carbondioxide produced by burning two moles of octane. D) What is the empirical formula of octane? Question 6 [4] (a) Draw electron dot diagram for the following: [4] (i) formation of ammonium ion (ii) X and Y where X belongs to Period 2 Group 16 and Y belongs to Period 3 Group 1 (b) Following questions are related to the preparation of Hydrogen chloride- [6] (i) Give an equation for the preparation of this gas. (ii) How is the gas collected and why? (iii) Name the drying agent used. (iv) Which method is used to prepare hydrochloric acid from hydrogen chloride? (v) What is the advantage of the above method? Question 7 (a) Distinguish between- [3] (i) A saturated and unsaturated hydrocarbon (type of reaction) (ii) Electrochemical series of cation and electrochemical series of anion (based on example of ion discharged with most difficulty) (iii) Electron affinity and ionization potential ( definition) (b) Calculate the percentage of platinum in ammonium chloroplatinate. [2] (NH4)2[PtCl6]. (N=14, H=1, Cl=35.5) (c) Give reasons:- [3] (i) Non-metallic nature decreases down the group. (ii) Covalent compound exist mostly as gases or liquids. (iii) Ferric chloride is stored in air tight containers. (d) Ammonia is prepared in the laboratory by heating a mixture of an ammonium salt with an alkali. [2] (i) Write relevant equation for the above mentioned method. (ii) How is the gas collected and dried? ****************************

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