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THE BISHOP S CO-ED SCHOOL, KALYANI NAGAR, PUNE PRELIMINARY (2) EXAMINATION (2015-2016) SUBJECT: CHEMISTRY CLASS : X (10) READING TIME : 15 MINS TOTAL MARKS : 80 WRITING TIME : 2 HOURS TOTAL NO. OF PAGES : 4 ------------------------------------------------------------------------------------------------------------------------------------------------ -----------------------Section I is compulsory. Attempt any 4 questions from Section II. The intended marks for questions or parts of questions are given in brackets [ ]. All chemical equations must be balanced. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Section I (40 marks) Attempt all the questions from this section. Question 1. a. Select the correct answer from the options given below. i. An element is period 3 whose electron affinity is zero (A) Neon (B) Sulphur (C) Sodium (D) Argon ii. If empirical formula of an organic compound is CH2O then it s molecular formula can be (A) C2H2O2 (B) C2H4O2 (C) C3H6O (D) C6H12O6 iii. Dilute sulphuric acid will produce a white precipitate when added to a solution of (A) Lead Nitrate (B) Zinc Nitrate (C) Copper Nitrate (D) Sodium Nitrate iv. The pH of a solution which reacts with ammonium chloride to liberate ammonia is (A) 7 (B) more than 7 (C) less than 7 (D) less than 3 v. The metal zinc and tin are present in the alloy (A) Bell Metal (B) Brass (C) Bronze (D) German Silver vi. An ore that is calcinated ? (A) PbO (B) ZnS (C) ZnCO3 (D) Fe2O3 vii. Which of the following has smaller size ? (A) Al (B) Al+ (C) Al2+ (D) Al3+ viii. Hydroxide of this metal is soluble in sodium hydroxide solution (A) Magnesium (B) Lead (C) Copper (D) Silver ix. The metallic electrode which does not take part in an electrolytic reaction (A) Cu (B) Ag (C) Pt (C) Ni x. Hydrogen Chloride gas being highly soluble in water is dried by (A) Anhydrous Calcium Chloride (B) Phosphorous Pentoxide (C) Quick Lime (D) Conc. Suphuric Acid b. Name the following [Formula NOT acceptable]. i. The anion present in the salt solution that reacts with barium chloride to form white precipitate insoluble in hydrochloric acid. ii. Two acidic gases that bleach, one colourless and the other coloured. iii. The anion present in the salt solution that reacts with dil. Sulphuric acid to give a gas with brisk effervescence that has no effect on acidified potassium dichromate solution. iv. An acidic gas that can be oxidized to sulphur and which turns acidified potassium permanganate solution from pink to colourless. v. A basic gas that turns Nessler s reagent brown. c. Complete the reactions and mention the property exhibited by the underlined compounds. i. PbO + NaOH ii. S + H2SO4 iii. NH3 + PbO iv. CuO + HNO3 v. PbO2 + HCl d. Match the following. [10] [5] [5] [5]
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