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GOLDCREST HIGH, LATUR 2nd TERM END EXAMINATION (2018-19) GRADE: 9 SUBJECT: SCIENCE PAPER-2 (CHEMISTRY) Time: 2 Hours Max. Marks: 80 Answer to this question must be written on the paper provided separately. You will not be allowed to write answers for the first 15 minutes. This time is to be spent on reading the question paper. The time given at the head of this paper is the time allotted for the writing the answer. The paper is divided into two sections. Attempt all questions from Section A and any four questions from Section B. The intended marks for questions or parts of questions are given in brackets [ ] SECTION-I (40 Marks) (Attempt all questions from this Section) Question-1 (a) Write the balanced Chemical equation for the following reactions: [5] (i)Silver oxide + hydrogen peroxide Silver + water +oxygen. (ii)Aluminium + sodium hydroxide +water sodium aluminate + hydrogen. (iii)Iron + hydrochloric acid Iron(II) chloride +hydrogen. (iv)Potassium bicarbonate + Sulphuric acid Potassium sulphate +carbon dioxide + water. (v) Potassium Hydroxide + Nitric acid Potassium Nitrate + water. (b) Fill in the blanks from the words A to F below. A: Decreases B: Increases C: Remains same [5] D: Increase by one E: Electropositive F: Electronegative (i)Across a period from left to right in the modern periodic table: No. of electron shells_____; No. of valence electrons______; Electronegativity_______; Character of elements changes from _______to______. (ii)Down a group in the modern periodic table: No. of electron shells_____; No. of valence electrons______; Electronegativity_______; Character of elements changes from _______ to ______. (c) Give appropriate scientific reason for the following statements: (i) Alkali metals are good reducing agents. [5] (ii) The mass number of an atom is slightly less than the actual atomic mass. (iii) Why Nitric acid and hot concentrated sulphuric acid not used in the preparation of hydrogen? (iv)Why Caesium is the most metallic element and Flourine is the most non-metallic element? (v) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air. TEE-2/CHE/2018-19/KSH This question paper consists of 5 printed pages and 1 blank page Page 1
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