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ICSE Board Exam 2017 : Chemistry

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Vikash Kumar
Rajendra Vidyalaya (RV), Jamshedpur

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CHEMISTRY SCIENCE Paper 2 (Two hours) 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. Section I is compulsory. Attempt all questions from Section II The intended marks for questions or parts of question are given in brackets [ ]. SECTION I (40 MARKS) Attempt all questions from this Section Question 1 (a) You are provided with the following substances. [5] Lead chloride, Zinc Sulphide, Sodium Carbonate, Lead Nitrate, Calcium Chloride, Calcium Sulphite, Zinc Carbonate, Silver nitrate, Ammonium Carbonate Choose one of the substances that matches the description. (i) A normal salt formed when a basic oxide and acidic oxide react. (ii) An insoluble carbonate. (iii) A salt that decrepitates on heating. (iv) An insoluble salt formed from two soluble salts. (v) A salt on heating leaves metal as residue. (b) Choose the most appropriate options:(i) [5] Which of the following is the characteristics of a covalent compound:(a) Always soluble in water (b) Consists of molecules (c) Conducts electricity when it is in the molten state (d) High melting point (ii) A compound that liberates reddish brown fumes around anode during electrolysis in its molten state is :- (iii) (a) Sodium chloride (c) Copper (II) sulphate (b) Lead bromide (d) Ethyl Bromide An organic compound that undergoes addition reaction and gives a red precipitate with ammoniacal cuprous chloride (a) Ethane (b) Ethane (c) Ethanol (d) Ethyne (iv) Constituent of duralumin is :(a) Manganese (b) Magnesium (c) Aluminium (d) Iron (v) A nitrate that evolves laughing gas:(a) Ammonium nitrate (b) Calcium nitrate (c) Lead nitrate (d) Sodium nitrate (c) Distinguish between the following compounds using the test given in the brackets:(i) Ferrous sulphate and ferric sulphate (using sodium hydroxide) (ii) Sodium sulphide and sodium sulphite (using sulphuric acid) (iii) Manganese dioxide and copper oxide (using concentrated hydrochloric acid) (iv) Ethane and ethyne (using alkaline potassium permanganate) (v) Lead chloride and zinc chloride (using ammonium hydroxide) (d) Write equations for the following:(i) Aluminium oxide and sodium hydroxide (ii) Zinc and dilute sulphuric acid (iii) Copper and conc. Sulphuric acid (iv) Sulphur and conc. Nitric acid (v) Concentrated sulphuric acid and sugar. (e) Give suitable reasons for the following:(i) Glauber salt looses weight on exposure to dry atmosphere. (ii) During electro-refining anode diminishes and gets finished. (iii) 90% of all compounds known are organic in nature. (iv) Electrolysis of acidulated water is considered as an example of catalysis. (v) Conc. Nitric acid is not used during the preparation of Hydrochloric acid. (f) State your observation:- [5] [5] [5] [5] (i) Ammonia is passed over litharge. (ii) Water is added to the product formed when aluminium is burnt in a jar of nitrogen gas. (iii) Ammonium hydroxide is added first drop wise and then in excess to a solution of zinc sulphate. (iv) Ethanol reacts with acetic acid in the presence of concentrated sulphuric acid. (v) Green vitriol crystals are heated in a test tube. (g) Answer the following questions:- [5] (a) A compound with empirical formula AB2 has a vapour density equal to its empirical formula weight. Find its molecular formula. (b) 16.4gm of calcium nitrate is heated. Give the equations for the above reaction. Calculate :i. The volume of nitrogen dioxide obtained at STP. ii. Mass of calcium oxide obtained. (Ca=40, H=1, O=16,N=14) (h) Identify the following substances:- [5] i. An acidic gas that gives dense white fumes with ammonia. ii. An alkane which can also be called a greenhouse gas. iii. A solid which when kept in open, forms a solution after some time. iv. An alloy used in electrical fittings. v. A metal which gives hydrogen gas on reacting with both dilute acid and alkali. SECTION II (40 Marks) Attempt all questions from this section. Question 2. (a) The following questions refers to the periodic table:i. Name the element of third period and group 17. ii. Name the element with highest ionisation potential iii. Why do nobel gases have zero electron affinity? iv. Name the element which may be placed on group 1 but is not a metal. v. Name the element with highest electronegativity. [4] (b) An atom P has 2, 8 , 7 electronic configuration combines with Q with one electron in its valence orbit. [3] i. Write the formula of the compound formed. ii. State the type of bond between P and Q. iii. Is the compound stated by you soluble in water? Give reason for your answer. (c) Acids dissolve in water to form a positively charged ions. Show the formation of the positively charged ion. [3] Question 3. (a) Draw a neat labelled diagram for the nickel plating on an iron key. State the reactions taking place at the respective electrodes. (b) (i) Calculate the number of particles in 0.1 mole of sulphuric acid. [3] [3] (ii) How many grams of H2O4 are present in 0.2 moles of it? (iii) Find the volume occupied by 4.5 grams of ammonia at STP. (c) Copy and complete the following table related to electrolysis:- [4] S.No Name of electrolyte Name of cathode Name of anode 1. CuSO4 (aq) Copper Copper 2. PbBr2 (molten) Platinum Platinum Product at cathode Product at anode (reaction) (reaction) Question 4. (a) A compound has the following percentage composition by mass, carbon-14.4%, hydrogen 1.2%, chlorine 84.5%. Determine the formula of the compound. If the vapour density of the compound is 84, find the molecular formula of the compound. (b) The following questions are relevant to the electrolytic extraction of aluminium. i. Why is caustic alkali added to bauxite ore during its purification? Write equation. ii. Why is fluorspar added to the electrolyte? iii. Why is powdered coke sprinkled on the surface of the electrolyte? [3] [3] (c) Name the method of preparation of the following salts and write a balanced equation for:i. Ferric chloride ii. Sodium sulphate iii. White vitriol iv. Lead chloride [4] Question 5. (a) Answer the following questions with reference to the industrial preparation of nitric acid:i. Name the process. ii. Write equations for the catalytic oxidation of ammonia. iii. Why the ratio of air is high as compared to ammonia? iv. Quartz is used in the absorption tower. Why? (b) Give balanced equations for the following conversions:i. Ethanoic acid to sodium ethanoate ii. Ethene to 1,2-Ethane diol iii. Ethanol to Diethyl ether [4] [3] (c) 36 litres of ammonia is heated with 72lit of oxygen in the presence of platinum catalyst. Write a chemical equation for the above statement. Calculate the volume of resultant mixture. [3] Question 6. (a) Give reason why:- [2] i. Carbon tetra chloride does not conduct electricity. ii. Aluminium is reduced by electrolytic reduction. (b) A white solid P, on heating, decomposes to give reddish brown gas R and a resdue Q. the residue Q is yellow when hot and white when cold. The solution of white solid P in water dissolves in excess of caustic soda solution to form colourless solution. i. Identify P,Q,R. ii. Represent with a chemical equation. (c) Answer the following question:- [3] [2] i. Sulphuric acid is not prepared by direct addition of water to sulphur trioxide. Why? ii. Name the catalyst used during the contact process. Why is the catalyst preferred? (d) Give suitable equations to show:i. Reducing nature of ammonia using yellow metallic oxide. ii. Oxidizing nature of conc hydrochloric acid using black metallic oxide. iii. Non-volatile nature of sulphuric acid. [3] Question 7. (a) Why all glass apparatus is used in the lab preparation of nitric acid? Why nitric acid cannot be concentrated beyond 68% by boiling? [2] (b) Draw the structures of the following compounds and name the functional groups associated with the following :i. 2,3-dichloro pentane ii. 2-methyl butan-1-ol iii. 2,2-dimethyl butan-1-al iv. 4-methyl pent-2-yn-1-oic acid (c) Answer the following with reference to acetylene gas:i. Write equation for the lab preparation. ii. Why does it give addition reaction? iii. How is acetylene converted to acetaldehyde directly? iv. Write the IUPAC names for the next two homologous of acetylene. [4] [4]

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