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LOKHANDWALA FOUNDATION SCHOOL TERMINAL EXAMINATION-2020-21 SUBJECT:-CHEMISTRY SCIENCE Paper - 2 Date: 15/10/20 Duration: 2 Hrs. Grade: 10 Max. Marks: 80 __________________________________________________________________________________________ Instructions:-This question paper consists of two sections I & II . Section I is compulsory. Attempt any four questions from section II. The paper consists of 4 pages. ____________________________________________________________________________________________ SECTION I (40 marks) Attempt all questions from this Section Q 1. a. Identify the term used in the following. [5] i. Compounds in which the shared pair of electrons is unequally distributed. ii. The salt formed by partial replacement of a replaceable hydrogen ion of an acid by a basic radical. iii. The tendency of an atom to attract electrons towards itself when combined in a compound. iv. The role of ammonia to convert metallic oxide to metal. v. A base which is soluble in water. b. Use the appropriate word given in the bracket and fill in the blank. [5] i. Metals are good ______ (oxidising agents / reducing agents) because they are electron _______ (acceptors / donors). ii. The H1+ ion is formed by the _____ (loss/gain) of an electron. iii. When sodium chloride reacts with silver nitrate solution, a ______ (milky white/ curdy white) precipitate is formed which is _______ (soluble/insoluble) in excess of ammonium hydroxide. c. Write balanced chemical equation for the following along with conditions if any: i. Hot concentrated nitric acid reacts with carbon. ii. Zinc carbonate reacts with dilute sulphuric acid. iii. Ammonium hydroxide is added to ferric chloride solution. iv. Catalytic oxidation of ammonia. v. Zinc reacts with dilute hydrochloric acid. [5] d. Choose the correct option. i. Concentrated sulphuric acid does not show A. Oxidising property B. Reducing property C. Non- volatile nature D. Dehydrating property ii. 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 iii. A salt which decrepitates on heating A. NaCl B. CaCl2 C. Pb (NO3)2 D. All of them iv. An acid which as four hydrogen atoms and is monobasic in nature. A. Sulphuric acid B. Formic acid C. Acetic acid D. Phosphoric acid v. A greenish yellow gas which has strong oxidising property. A. Nitrogen dioxide B. Carbon monoxide C. Hydrogen D. Chlorine [5] e. State one relevant observation for the following. i. Sodium hydroxide is added to zinc sulphate in less and then in excess quantity. ii. A pinch of calcium nitrate is heated in a dry test tube. iii. Dilute hydrochloric acid is added to copper sulphide and heated. iv. Ammonia reacts with excess chlorine gas. v. Acidified Iron (II) sulphate solution is added to dilute nitric acid. [5] f. A. Write the formula of: i. Diammine silver chloride ii. Tetrammine copper sulphate B. Draw the electron dot structure of: i. Hydronium ion ii. Nitrogen molecule iii. Methane [2] [3]
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