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ICSE 2016 CHEMISTRY MOCK PAPER

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CHEMISTRY SCIENCE PAPER-2 (Two hours) Answer 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. Attempt all questions from Section 1 and any four from Section II . The intended marks for question or parts of questions are given in brackets [ ] SECTION I (40 Marks) Attempt all questions from this Section Question 1 A Name the following : 1. 2. 3. 4. 5. 6. 7. 8. [8] O Hydrocarbon containing a C functional group. Least reactive metal of group II A. An explosive formed when ammonia reacts with greenish-yellow gas. A metallic sulphide soluble in water. A metal which can be casted easily and expands on solidification. A non-metal which forms a gaseous neutral oxide and a coloured acidic oxide. A gas which burns with greenish-yellow flame. A non-metal which is a good conductor of electricity. B Correct the following statements : [3] 1. Nitric acid reacts with magnesium to liberate a gas, which gives pop sound with air. 2. Under the same condition of temperature and pressure, all gases contain same number of molecules . 3. Aluminium nitride reacts with water to give pungent smelling gas. C State the observation for the following : [5] 1. Bromine gas is passed into the ethyne gas dissolved in carbon tetra chloride. 2. Concentrated Sulphuric acid is added drop-wise to the crystal of hydrated copper sulphate 3. Copper is added to cold dilute nitric acid and the gas evolved is bubbled in ferrous sulphate solution. 4. A piece of sodium is dropped in the test tube containing ethyl alcohol. 5. Copper sulphide is treated with diluted hydrochloric acid. D Give I.U.P.A.C names for the following compounds : 1. Cl O H3C CH CH C H CH2 CH3 2. CH3 O Cl H3C CH CH C CH CH CH3 CH3 CH3 [4] 3, 4. Cl H3C C C CH3 CH2 CH3 Cl CH2 CH3 | H3C CH2 CH CH C CH3 CH3 OH E Give balanced equations for the following for the following reactions 1. Ammonia is burnt in the air. 2. Copper with hot concentrated nitric acid. 3. Ethyl alcohol to di- ethyl ether. 4. Ethyne from calcium carbide. 5. Excess of ammonia with chlorine. 6. Sliver chloride with excess of ammonium hydroxide solution. [6] F Choose the correct alternative from the multiple choices given 1. The salt insoluble in water. i. ZnSO4 ii. Na2O iii. (NH4)2CO3 iv. CaSO4 2. The process by which anions gets discharged as neutral atom at the anode i. Reduction ii. Oxidation iii. Ionisation iv. Dissociation 3. The strip of copper when placed in this colourless solution, it turns the solution, blue. i. KNO3 ii. AgNO3 iii. Zn(NO3)2 iv. Ca(NO3)2 4. The organic compound obtained by the dehydrohalogenation of 1,2 di bromo ethane is i. Ethene ii. Ethyne iii. Ethanol iv. Ethanal 5. Which of the following is NOT a property of metals i. Low electron affinity ii. Strong metallic character iii. Low ionisation energy iv. Small atomic radii. [5] G Give scientific reason for the following : 1. Ethene is more reactive than ethane. [5] 2. Planks of wooden shelves stains black when concentrated sulphuric acid is accidently fallen. 3. Nitric acid cannot be concentrated beyond a certain value. 4. Concentrated solution of NaOH is used in the enrichment of the bauxite ore. 5. Sodium and Potassium cannot be exposed to air. H Solve the following : [4] The compound A has the following percentage composition by mass: Carbon 26.7%, oxygen 71.1%, hydrogen 2.2%. Determine the empirical formula of A. If the relative molecular mass of A is 90, what is the molecular formula of A? [H = 1; C = 12; O = 16] Section B (40 Marks) Attempt Any Four questions from this Section Q2 A With reference to the laboratory preparation of alkaline air 1. Why mixture of ammonium nitrate and slaked lime is not used? 2. Which compound is normally used as drying agent? 3. Why the aqueous solution of this gas can be used as a cleansing agent? 4. Give an equation and observation wherein this gas acts as a reducing agent. 1. 2. 3. 4. 5. Q3 B Give branched structural formula for the following Acetone 1, 1, 2, 2- terta chloro ethane Ethoxy ethane Butanal 3 methyl pentanone 2 A During the electrolysis of aqueous CuSO 4, using copper electrodes 1. Why traces of dilute Sulphuric acid is added to the electrolyte? 2. Write down reaction at cathode and anode. 3. Write down observations at cathode and anode. [5] [5] [5] B A white crystalline solid X is treated with concentrated Sulphuric acid. A colourless gas Y is evolved, even when the reaction mixture is not heated and a lot of frothing takes place in the reaction mixture. The gas Y fumes strongly in air and gives dense white fumes with ammonium hydroxide solution. [5] 1. Identify the gas Y 2. If the solid contains sodium as cation, identify X. 3. Why does Y fumes strongly in air? 4. Write balanced equation between a. X and concentrated Sulphuric acid b. Y and ammonium hydroxide solution Q4 A Identify the anions present in the salts on the basis of the following observations [5] 1. When silver nitrate solution is added to a solution A, a white precipitate, insoluble in dilute nitric acid is formed. 2. Addition of dilute hydrochloric acid to B produces a gas, which turns lead acetate paper black. 3. Manganese di oxide when added to a compound C along with concentrated Sulphuric acid produces a gas, which when passed on starch iodide paper, turns it blue-black. 4. When barium nitrate is added to D, produces a white precipitate, insoluble in mineral acid. 5. When dilute Sulphuric acid is added to E, a gas is produced which turns acidified potassium dichromate solution from orange to green. B Compound A is bubbled through bromine dissolved in carbon tetra chloride and the product is CH2 Br CH2 Br. [5] 1. Draw the structural formula of A. 2. What type of reaction has A undergone? 3. What is your observation? 4. Name the compound formed when steam reacts with A in presence of phosphoric acid. 5. What is the procedure for converting the products of 4 back to A? Give chemical equation. Q5 A Give balanced equations for the following preparation using Sulphuric acid. Also mention the property of acid involved. [6] 1. Preparation of carbon di oxide from carbon. 2. Preparation of copper sulphate from copper oxide. 3. Preparation of nitric acid. B [2] C Q6 Draw the electron dot structure for the formation of ammonium ion Distinguish between metallic conduction and electrolytic conduction. [2] [4] B Solve the following 1. According to the equation: 2H2S+ 3O2 2H2O + 2SO2 What volume of hydrogen sulphide at STP will burn in oxygen to yield 12.8g of sulphur dioxide? For the volume of hydrogen sulphide determined in the above, what volume of oxygen would be required for complete combustion? [H = 1; O = 16; S = 32] 2. Calculate the mass of 70 litres of carbon dioxide at STP? [4] C Give composition and use of the following alloys 1. Nickel steel 2. Bronze Q7 A Name the following metals and the reason for its use in the application 1. A metal used in thermite welding. 2. A metal used in galvanisation. [2] A Following questions are related to the metallurgy of aluminium [5] 1. Give the reactions to show the purification of the ore by Baeyer s process. 2. Why is powdered coke sprinkled over the electrolytic mixture in the extraction of this metal? 3. In construction work, why is duralumin used rather than pure aluminium? B Give a chemical test to distinguish between 1. Ethene and ethane 2. Zinc nitrate and zinc sulphate 3. Ferric chloride and magnesium chloride [3] C Give reasons 1. IP increases across the period 2. Alkali metals are good reducing agent [2]

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