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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
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