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ICSE Prelims 2016 : Chemistry

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Yasen Ali Syed Shakil
International School, Hyderabad

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Class-X Marks:80 Subject: Chemistry Time:2Hrs. 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 on 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 any four questions from Section II. The intended marks for questions or parts of questions are given in brackets ( ). Section I (40 Marks) Answer all the questions Question 1 a) Select the correct answers from A, B, C or D for the following statements: i) ii) An element X belongs to Group 2 of period 3. Then X has A) 3 valence electrons and 2 shells B) 2 valence electrons and 3 shells C) 2 valence electrons and 2 shells D) 1 valence electron and 2 shells Which of the following compound is not suitable for the preparation Ammonia by heating with an alkali? A) Ammonium sulphate B) Ammonium chloride C) Ammonium nitrate D) Ammonium sulphate and Ammonium chloride iii) Which of the following statement is not correct regarding electrolysis process: A) Cations get discharged at cathode B) Anions get oxidized at anode C) Metal deposits at anode D) Inert electrodes do not participate in electrolytic reaction. iv) The catalyst used in the preparation of Ammonia in Haber s process: A) Iron B) Platinum C) Silver D) Nickel v) Acidity of a base is defined as A) The number of Hydronium ions produced by one molecule of the base B) The number of Hydrogen ions produced by one molecule of an acid C) The number of Hydroxyl ions produced per molecule of the base in its solution D) The number of hydroxyl ions that a base contains b) Fill in the blanks:i) Sulphur reacts with Conc. ____________(HCl/HNO3) to give Sulphuric acid. ii) Strong acids dissociate ______________( completely/partially)tom give a high concentration of Hydronium ions in their aqueous solutions. iii) _______________ (Electrorefining / electroplating) makes an article attractive. iv) Aqueous solution of Ammonia is called ______________ (liquor/ liquid) ammonia. v) Nitric acid is a _______________(non-volatile/ volatile) acid. 5M c) Name the following. i) ii) iii) iv) v) 5M The gas which gives white dense fumes with Ammonia gas. The element with highest electronegativity. The electrolyte used in the electroplating with Silver metal. The gas released when Ammonium salts are heated with alkali. The explosive liquid formed when ammonia reacts with excess Chlorine gas. d) Correct and rewrite the following statements. i) ii) iii) iv) v) 5M Metallic character decreases with the tendency to lose electrons. Ammonia gas is released when metal nitrides are treated with water. Calcium salts produce a blue precipitate with Ammonium hydroxide. Nitric acid on heating decomposes to Nitrogen gas. Silver ion is reduced by anode during the electrolysis of aqueous Copper sulphate. e) Give reason why: i) Ionisation potential decreases down a group. ii) Dilute H2SO4 is preferred dil. HNO3 to dilute water before its electrolysis. iii) In the catalytic oxidation of Ammonia gas, Platinum metal continues to glow even after heating is discontinued. iv) Dil. Sulphuric acid used preferred for the acidification of Water before electrolysis. v) Metal nitrides are not preferred to prepare Ammonia gas. f) State your observations when: i) Dry Ammonia gas is burnt in the atmosphere of Oxygen. ii) During the electrolysis of Copper sulphate solution using inert electrodes. iii) Ammonia gas is mixed with excess Chlorine gas. 5M iv) Ammonium hydroxide is added to Copper sulphate solution in small amounts then in excess. v) Conc. Nitric acid is heated with Copper metal.s g) Select the suitable word from the list given in brackets for each of the following statements. ( Ammonia, Magnesium chloride, Hydroxyl ion, Nitrogen dioxide, 7, Hydronium ion, fused Lead bromide, Acetic acid) i) ii) iii) iv) v) The number of electrons present in the outer most shell of a halogen. The ion which is responsible for the acidic nature of an acid. A strong electrolyte. The basic gas released when Ammonium salts are heated an alkali. A soluble salt. h) Write the empirical formulae of the following compounds. i) Glucose ii) CH3CH3 iii) C4H10 5M iv) Acetic acid v) Formic acid Section II (40 Marks) Answer any four of the following questions Question 2 (3+3+2+2) a) M is an active metal. Its oxide has the formula MO. i) ii) iii) i) ii) iii) What would be the valency of that metal? Write the formula of its hydroxide. State the group number it belongs to. b) X, Y and Z are the elements with the atomic numbers 9,11 and 10 respectively. Then Write the electronic configuration of the element Y. Identify the halogen among them. Which of them has the highest ionization potential value? c) i) Atomic radius ___________decreases/ increases across a period. ii) An element has atomic number 5. Then it is a __________ metal/nonmetal/metalloid. d) Arrange the following elements according to the description given in brackets: Na, Li, K, Cs (increasing order of atomic radius) O,C, B, F (decreasing order of Electronegativity) i) ii) Question 3 (2+2+2+4) a) i)Write the balanced equation for the preparation of Ammonia in laboratory method. ii) Name the reactants used in Haber s process. b) State the observations seen when: i) Ammonia gas is passed over heated Copper oxide. ii) Red litmus solution enters the round bottom flask filled with Ammonia gas in fountain experiment. c) i) Name the acidic gas that reacts with excess Ammonia gas to produce Ammonium chloride and Nitrogen gas. ii) Mention any one chemical test of Ammonia gas. d) Z i) ii) iii) iv) Y Name the catalyst X . State the observation seen the round bottom flask. Identify the gas formed in the round bottom flask. What is the required temperature for this reaction to take place? Question 4 (4+4+2) a) i) Oxidation takes place at ___________ (anode/cathode) during an electrolysis process. ii) Name the electrolyte and the anode used during the electroplating of an article with Nickel. iii) Differentiate between anode and cathode. b) Answer the following questions pertaining to the electrolysis of fused Lead bromide. i) Name the gas released at anode. ii) State one appropriate observation during the process. iii) Graphite is preferred as anode in this process. iv) Write balanced equation for the reaction at cathode. c) i) Give reason why direct current should be passed through the electrolyte during electrolysis. ii) Name the anode taken in the electro-refining of Copper metal. Question 5 (4+4+2) a) Write balanced equations for the following conversions: i) Dil. Sulphuric acid to sodium siulphate. ii) Preparation of an insoluble salt using dil. HCl. iii) Lead nitrate to Lead sulphate. iv) Sulphur dioxide to Sulphurous acid. b) Identify A, B, C and D in the following reactions. i) Fe A FeCl2 B Fe(OH)2 C CaO i) ii) Name the gases released when a dil. acid reacts with an active metal. Name the complex salt formed when a copper salt is treated with excess of Ca(NO3)2 D ii) CaSO4 c) Ammonium hydroxide. Question 6 4+4+2 a) i) Write the balanced equation for the preparation of Nitric acid in the laboratory method ii) State any one precaution to be taken during the above process. iii) Give reason why Conc. HCl is not used in this reaction. iv) How do we remove dissolved NO2 from Nitric acid? b) i) State your observation when Conc. Nitric acid undergoes thermal decomposition. ii) Write the composition of Aqua regia and state its significance. iii) Name the test used to identify nitrate ion in a given solution. c) i) Which property of Conc. HNO3 helps in converting Sulphur to Sulphuric acid? ii) Explain why dil. Nitric acid does not give Hydrogen gas with active metals. Question 7 a) Copy and complete the following table. The cation present in the salt i) ________ ii) _______ iii) _______ iv) _______ 4+3+3 Colour of the precipitate formed when NaOH is added to the salt Dirty green Blue chalky white Reddish brown b) Calculate the percentage of i) Oxygen in Sodium hydroxide ii) Hydrogen in Sulphuric acid iii) Nitrogen in Ammonia c) Find the empirical formula and the molecular formula of a compound whose composition is C-40% , H-6.7% and rest is Oxygen. V.D is 90.

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