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ICSE Prelims 2017 : Chemistry Predictive Paper!

5 pages, 84 questions, 78 questions with responses, 163 total responses,

Sai S Kalyan
Indian Institute of Technology (IIT) Madras, Chennai
B.Tech in Aerospace Engineering

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Section A Attempt all questions (40 marks) Question 1 A. Name the following [5] 1. A solvent for wax 2. An orange compound which leaves a green residue and evolves a neutral gas on heating 3. The negative logarithm of H+ ion concentration expressed in moles/litre 4. The product formed at anode during electrolysis of conc. sodium chloride 5. The reagent that decolorizes on addition of ethene B. State what do you observe [5] 1. Aluminium nitrate crystals are heated in a hard glass test tube 2. Potassium iodide is heated with lead nitrate solution and then allowed to cool 3. Hydrogen sulphide gas is passed through acidified K 2Cr2O7 solution 4. Hot conc. nitric acid is added to sawdust 5. Ferrous sulphite solution is added to barium chloride solution followed by addition of dil. HCl C. Distinguish between the following [5] 1. Ethanol and ethanoic acid 2. Solid lead (II) carbonate and solid copper (II) carbonate 3. Zinc nitrate solution and lead nitrate solution 4. Ammonia gas and hydrogen chloride gas 5. Sodium sulphite solution and sodium sulphate solution D. Give balanced equations [5] 1. Conc. sulphuric acid is added to oxalic acid 2. Warm water added to the product formed on heating aluminium in nitrogen 3. Ammonia is catalytically oxidized 4. Conc. nitric acid is added to copper chips in a test tube 5. Aluminium is warmed with ferric oxide E. Choose the odd one and explain your choice. Valency is not a criterion. [3] 1. S, C, I, P 2. CO, SO3, N2O, NO 3. C2H2, C6H10, C4H8, C3H4 F. Give scientific reasons [5] 1. Copper is a good conductor of electricity but a non-electrolyte 2. Conc. sulphuric acid is both a drying agent as well as a dehydrating agent 3. Quartz is packed in layers in the absorption tower of Ostwald s process 4. Propane undergoes substitution reactions while propyne undergoes addition reactions 5. Alumina cannot be reduced to aluminium using coke while zincite can be reduced to zinc by coke G. Draw the electron dot diagram for the formation of the following: [2] 1. Ammonium ion 2. Carbon tetrachloride H. Choose the correct answer from the words given in brackets [3] 1. The number of C-H bonds in the first member of homologous series of alkenes is (2,4,6,8) 2. The ions given below are present in an aqueous solution. Which ion would be most readily discharged at anode? (Cu2+, OH-, Na+, I-) 3. The main product formed when acetic acid reacts with phosphorus pentachloride is (ethyl chloride, methyl chloride, acetyl chloride, acetylene dichloride) I. Identify the anion present: [2] 1. The salt soln. reacts with dil. sulphuric acid evolving a colorless gas with brisk effervescence which turns lime water milky but has no effect on acidified K 2Cr2O7 paper. 2. The salt soln. when heated with conc. sulphuric acid, forms vapours of an acid which on heating evolves a reddish brown gas which turns potassium iodide paper brown. J. Solve the following: 1. Find the mass of iron required to liberate 2.24 dm 3 hydrogen gas at STP from excess dil. HCl (Fe=56, H=1, Cl=35.5) [1] 2. 2500 cc. of oxygen was burnt with 600 cc. of ethene. Find the volumes of the resulting gases and residual oxygen. [1] 3. Find the(i) number of moles and (ii) number of atoms present in 96 g of hydrazine (N2H4), N=14, H=1 [1] 4. A hydrocarbon contains C=85.71% and H=14.28% and its vapour density is 21. Find its empirical and molecular formula. [2] Section B Attempt any four questions Question 2 (a) Arrange the following elements as directed: [3] 1. Na, Si, Cl , K, Ne (decreasing order of atomic radius) 2. Cs, K, Na, Cl, F (increasing order of metallic character) 3. Be, B, C, O, F (increasing order of ionization potential) (b) Give reasons: [2] 1. Electron affinity decreases on moving down a group 2. Periodicity of properties takes place in the Modern Periodic Table (c) Group 1. 2. 3. 4. 1 2 13 14 15 16 17 18 Li A B C D E F G H Name the most electropositive and most electronegative element from the table [1] Give the electron dot structure for compound formed between C and F. Also state the type of bond formed. [2] Give the letter and name of the metalloid from the table. [1] Give the electronic configurations of D and G. [1] Question 3 (a) Copy and complete the passage: [5] In Haber s process the gaseous inputs are --------------------- manufactured by fractional distillation of air and hydrogen manufactured by --------------------process, in the ratio 1:3 by volume. The commonly used catalyst is -----------along with a promoter --------------------- to increase the efficiency of catalyst. Formation of ammonia proceeds with --------------------- of heat, so it is an ----------reaction. According to Le Chatelier s Principle if a reaction is --------------------- forward reaction is favored by lowering the temperature. The yield of ammonia is low at very low temperatures so an optimum temperature of --------------------- degrees Celsius is used. According to Le Chatelier s Principle if a reaction proceeds with --------------------- in volume forward reaction is favored by increasing the pressure. The production plant may not withstand very high pressures so an optimum pressure of --------------------- atmospheres is used. (b) Find the odd one among HCl, H2SO4, HNO3 and H3PO4 and explain your choice. [1] (c) Give the full fledged balanced equation for the reaction taking place in Oxidation chamber of Contact Process. [1] (d) Give reasons: [2] 1. An all glass apparatus is used in laboratory preparation of nitric acid 2. An inverted funnel arrangement is used in laboratory preparation of hydrochloric acid (e) What is the property of conc. HCl when it is heated with potassium permanganate? Also give a balanced equation for the reaction [1] Question 4 (a) State whether the following are oxidation or reduction. Also, complete the equation. [2] 2+ 1. Mg -----> Mg 2. Pb4+------> Pb2+ (b) Give balanced equations mentioning the conditions: [8] A B C D Ethyl iodide------------>Ethane------------>Ethene------------>Ethanol------------>Ethanoic acid E F G Ethanoic acid------------>Ethanol------------>Ethene------------>Ethylene glycol |H Ethane Question 5 (a) State the method of preparation of salts from the list below: Neutralization [5] Neutralization followed by titration Oxidation Decomposition by acid Double decomposition Simple displacement Synthesis Salt Method of preparation Zinc sulphide Lead sulphate Lead nitrate Ferric sulphate Sodium sulphate (b) What is meant by an electrovalent bond? [1] (c) What is illicit alcohol? [1] (d) Classify the following as deliquescent, efflorescent, hygroscopic and anhydrous salts: [3] CaO, Fe(NO3)3, FeSO4, Na2SO4.10H2O, Na2CO3.10H2O, conc. H2SO4 Question 6 (a) State the main constituents of: [1] 1. Type metal 2. Bell metal (b) Following questions are related to extraction of aluminium: 1. Why caustic alkali is added to bauxite in concentration of impure ore? [1] 2. Why is powdered coke sprinkled over the electrolytic mixture in Hall-Heroult s Process? [1] 3. When does the charge control lamp glow? [1] 4. Give equations for reactions taking place at cathode and anode.[1] 5. Name the process used to refine impure aluminium. Name the cathode, anode and electrolyte for the same [2] (c) With respect to electroplating an article with silver [3] 1. Why a low magnitude direct current is used for a longer time than a high magnitude alternating current? 2. Name the electrolyte used. 3. Give the equation for electrolytic dissociation of electrolyte. Question 7 (a) Give the structural formula of: 1. 2-bromo 2-chloro 1-propanal 2. 2,2-dibromo 3,3-dichloro 1-propanoic acid (b) Name the electrolytic cell used for electrolysis of: 1. Acidulated water 2. Fused lead bromide [2] [3] 3. Copper (II) sulphate (c) Give balanced equations: [3] B and D are different gases, C is a solid A B NO<-------------------NH3------------------->NH4Cl C D N2<-------------------NH3------------------->NH4Cl E F HNO3------------------->H2SO4------------------->HCl (d) [2] 1. 1 mol. chlorine gas contains Y molecules. Find the number of molecules in 2 mol. ethane and 4 mol. fluorine under same conditions of temperature and pressure. 2. Find the mass of potassium chlorate that needs to be decomposed to produce oxygen necessary for complete combustion of one mole of ethene. Also find the volume occupied by carbon dioxide formed by the combustion of 1 mol. ethene. (K=39, Cl=35.5, O=16) 2KClO3 2KCl+3O2

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