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STD X DATE 03/02/2018 SMT. SULOCHANADEVI SINGHANIA SCHOOL SUB EXAM TIME MARKS CHEMISTRY PRELIM set C 2hrs 80 General Instructions i. This question paper is divided into two sections. ii. Section-I is compulsory. iii. Attempt any four questions in section-II. iv. The intended marks for questions or parts of questions are given in brackets []. SECTION I ( 40 Marks) (Attempt all questions) Q1. (a) For parts (i) (x) select the correct answer from choices A, B, C, D which are given. Write down only the letter corresponding to the correct answer. [5] (i) The metal oxide which can react with acid as well as alkali is A. Silver oxide B. Copper(II) oxide C. Aluminium oxide D. Calcium oxide (ii) Which of the following is not a common characteristics of a covalent compound? A. Low melting point B. Does not conduct electricity C. Consists of ions D. Insoluble in water (iii) The organic compound formed by the reaction of ethanoic acid with methyl alcohol is A. Methyl acetate B. Ethyl methanoate C. Ethyl acetate D. Ethyl formate (iv) Iron (II) sulphide is prepared in laboratory by A. Neutralization B. Precipitation C. Synthesis D. Direct combination (v) The volume occupied by 15 g of ethane at STP is (H = 1, C = 12) A. 5.6 dm3 B. 22.4 dm3 C. 11.2 dm3 D. 44.8 dm3 (b)Identify the anion from underlined word. [5] i) Salt solution with Barium chloride gives a white precipitate. ii) Salt & conc Sulphuric acid reacts to give a gas which fumes in moist air iii) Black salt reacts with conc Hydrochloric acid to give a greenish yellow colour gas iv) Salt on heating gives reddish brown colour gas v) Salt reacting with dilute acid gives a gas which turns acidified potassium dichromate solution green
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