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Chemistry Std.10 Public School Jeypore 27.11.2018 Surajit Chatterjee SECTION I (50 Marks) Attempt all questions from this Section Question 1 (a) Choose the correct answer from the options given below: (i) [5] Which of the following ores are calcined? A. Limestone B. Calamine C. Siderite D. All of the above. (ii) Electron affinity is maximum in: A. Alkali metals B. Alkaline earth metals C. Halogens D. Inert gases (iii) The components of Type Metal are: A. Copper, Zinc and Lead B. Copper , Antimony and Tin C. Copper , Lead and Tin D. None of the Above (iv) The drying agent used to dry NH3 is: A. P2O5 B. Conc. H2SO4 C. CaCl2 D. CaO (v) Which of the following is not soluble in Ammonium hydroxide (b) A. Cu(OH)2 C. Zn(OH)2 B. AgCl D. Pb(OH)2 Write balanced chemical equations (with all conditions) for each of the following: (i) (ii) (iii) (iv) (v) (c) Catalytic oxidation of ammonia Action of concentrated nitric acid on Phosphorus. Action of concentrated sodium hydroxide on Zinc oxide Reaction between acetic acid with ethanol in the presence of concentrated and hot H2SO4 Action of dilute hydrochloric acid on iron. State one observation (relating to colour) for each of the following: (i) (ii) (iii) (iv) (v) (d) [5] [5] Dilute Hydrochloric acid is added to Silver Nitrate solution. Concentrated Nitric acid is added to Copper turnings. Ethyne gas is passed through bromine (dissolved in Carbon tetra chloride) A little amount of Ammonia gas is passed through copper sulphate solution NaOH solution is added to calcium nitrate solution. Rewrite the following statements which are false [5] (i) Magnesium Nitride reacts with water to liberate Ammonia. (ii) Lead bromide conducts electricity. (iii) Starch iodide paper turns blue black in the presence of Chlorine. (iv) Hydrogen chloride molecule contains a covalent bond. (v) The principal metal in Alnico is aluminium. (e) (i) Given: C2H6 + O2 CO2 + H2O [3+2] 2000 cc of O2 was burnt with 400 cc of C2H6. Calculate the volume of CO2 formed and unused O2 (ii) Find the number of moles and molecules present in 7.1 g of Cl2. (At. Wt. Cl = 35.5) (iii) Calculate the vapour density of ethene [ C =12 , H = 1]
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