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icse chemistry prelim paper

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Saurabh Sharma
Moradabad Institute of Technology, Moradabad

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Chemistry-X Time: 2 hrs M.M: 80 General Instructions: I. II. III. This question paper is divided into two sections. Section I is compulsory. Attempt any four questions from section II Section I Question 1. (a) Name the following: (i) The complex salt formed when silver chloride dissolves in excess of ammonium chloride. (ii) A purple solid which produces a greenish yellow gas when treated with concentrated hydrochloric acid. (iii) A covalent compound which conducts electricity when dissolved in water. (iv) The gas which turns iron(II) sulphate solution brown. (v) A mixture of two concentrated acid which dissolves gold. 5 (b) Choose the most appropriate answer from the following options: (i) The type of bonding present in ammonium ion but not in ammonia is: (A) Coordinate (B) Ionic (C) Covalent (D) None of the above (ii)A compound which on burning produces four oxides is: (A) Blue Vitriol (B) White Vitriol (C) Epsom Salt (D) Green Vitriol (iii) A metal which react with very dilute nitric acid is: (A) Calcium (B) Magnesium (C) Copper (D) Zinc (iv) Which of the following is not a typical property of an ionic compound: (A) High melting point (B) Conducts electricity in aqueous solution (C) Insoluble in water (D) They are hard crystalline solid. (v) Nitrogen gas can be obtained by heating: (A) Ammonium nitrate (B) Ammonium Nitrite (C) Magnesium nitride (D) Ammonium chloride 5 (c) MnO2 + 4HCl MnCl2 + 2H2O +Cl2 1.746 g of pure MnO2 is heated strongly with conc. HCl. Calculate: (i) Moles of MnO2 used (ii) Mass of salt formed (iii)Moles of chlorine gas formed (iv)Volume of chlorine gas formed at STP (v) Mass of acid required [Mn=55, Cl=35.5, O=16, H=1] 5 (d) What do you observe when: (i) Red lead is heated strongly. (ii)When ammonia is passed over copper oxide. (iii)When bromine water is added to usaturated alkenes. (iv)When conc. Sulphuric acid is added to sugar. (v)When 5 Hydrochloric acid is added to silver nitrate. (e) Give reasons for the following: (i) Ionic compounds have high melting and boiling point. (ii)Nitric acid obtained in the laboratory has a yellowish tinge. (iiiAn aqueous solution of sodium chloride conduct electricity. (iv)The oxidising power of elements increase on moving from left to right along a period in periodic table. (v)Hydrogen chloride can be termed as polar covalent compound. 5 (f) Write balanced chemical equation for each of the following: (i) Sodium thiosulphate is reacted with dilute hydrochloric acid. (ii)Calcium bicarbonate reacts with dilute hydrochloric acid. (iiii)Dilute sulphuric acid is poured over sodium sulphite. (iv)Lead nitrate solution is added to sodium chloride solution. (v)Zinc is heated with sodium hydroxide solution. 5 (g) 3 (i)Give the structural formula of the following: (i) 2,2 Dimethyl butane (ii) 3-methylprop 2-ene (iii) 2-methyl propane (ii) What is oleum? 1 (iii) Name the process used for the enrichment of sulphide ores. 1 (h)Answer the following questions: (i) 2 (ii) Draw the structure of: What are coordinate compounds? (A) MgO (B) 3 NH 4+ Section-II Question 2. (a) State your observation in each of the following cases: (i) When dilute hydrochloric acid is added to sodium carbonate crystals. (ii) When access sodium hydroxide is added to calcium nitrate solution. (iii) At the cathode when acidified aqueous copper sulphate solution is electrolyzed with copper electrodes. (iv) When calcium hydroxide is heated with ammonium chloride crystals. (v) Electricity is passed through molten lead bromide. 5 (b) Study the figure given below and answer the questions that follows: (i) Identify the dry gas. (ii)What property of this gas does this experiment demonstrate? (iii)Name another gas which has the same property and can be demonstrated through this experiment. 3 (c) Give balanced equations for the following: (i) Laboratory preparation of nitric acid. (ii) Preparation of ethanol from monochloroethane and aq. Sodium hydroxide. 2 Question 3. (a) State the main components of the following alloys: (i) Brass (ii) Duralumin (iii) Bronze (b)Give one equation each to show the following properties of sulphuric acid: 3 (i) Dehydrating property (ii) Acidic nature (iii) As anon volatile acid 3 (c) A cylinder contains 68 g of ammonia gas at STP. (i) What is the volume occupied by this gas? (ii) How many moles of ammonia are present in the cylinder? (iii) How many molecules of ammonia are present in the cylinder? 4 Question 4. (a) Give balanced chemical equations to prepare the following salts: (i) Lead sulphate from lead carbonate. (ii) Sodium sulphate using dil. Sulphuric acid. (iii) Cooper chloride using copper carbonate. 3 (b) An element Z has atomic number 16. Answer the following questions on Z: (i) State the period and group to which Z belongs. (ii) Is Z a metal or non-metal? (iii) State the formula between Z and hydrogen. (iv) What kind of a compound is this? 4 (c) Write necessary conditions for Haber s process. 3 Question 5 (a) 8 Group number IA IIA IIIA IVA VA VIA VIIA 0 1 Li A R 2 13 D E I 14 15 2nd period 3rd period 4th + period 16 O H U 17 J M 18 Ne Mg T Si Q Y In this table H does not represents Hydrogen. Some elements are given in their own symbols and position in the periodic table. While others are shown with a letter. With reference to the table answer the following questions: (i) Identify the most electronegative element. (ii) Identify the most reactive element of group 1. (iii) Identify the element from period 3 with least atomic size. (iv) How many valance electrons are present in Q? (v) Which element from group 2 would have the least ionization energy? (vi) Identify the noble gas of the fourth period. (vii) In the compound given A and H what types of bond would be formed and give the molecular formula for the same? (b) Define the following terms: (a) Hygroscopic substance (b) Alloy 2 Question 6. (a) (i)With the help of equations, give an outline for the manufacture of sulphuric acid by the contact process. (ii)What property of sulphuric acid is shown by the reaction of concentrated sulphuric acid when heated with: (a) Potassium nitrate (b) Carbon 5 (b) (i)What is the special feature of the apparatus that is used in the laboratory preparation of nitric acid? (ii) Why should the temperature of the reaction mixture of nitric acid not be allowed to rise above 200 0 C? 2 (c) Write balanced chemical equations for the following: (i) Chlorine reacts with excess of ammonia. (ii) Ferric hydroxide reacts with nitric acid. (iii) Zinc oxide dissolves in sodium hydroxide. 3 Question 7. (a) Give the product of electrolysis of: (i) CuSO4 solution using copper electrodes. (ii) Concentrated NaCl solution using platinum electrodes. (b) What are the conditions for good electroplating? (c) 5 2 Explain with the help of balanced chemical equation the brown ring test for nitric acid. 2 (d) Give suitable chemical term for the following: A reaction in which hydrogen of an alkane is replaced by halogen. 1

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