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MADHUSTHALI VIDYAPEETH F.M 80 Time 2h Date : FIRST ASSESSMENT : 2019-2020 SUBJECT: CHEMISTRY CLASS- IX SECTION I (40 Marks) Attempt all questions from this section. Question 1 a) Choose the correct answer from the options given below: [5] i) Volume-temperature relationship is given by (Boyle s / Gay Lussacs / Dalton / Charles). ii) The valency of nitrogen in nitrogen dioxide (NO2) is (one/two/three/four). iii) The correct formula of aluminum oxide is (AlO3/AlO2/Al2O3). iv) In water, the hydrogen-to-oxygen mass ratio is (1:8/1:16/1:32/1:64). v) The absolute temperature value that corresponds to 27OC is (200K/300K/400K/246K). b) Fill in the blanks: [5] i) The temperature on the Kelvin scale at which molecular motion completely ceases is called ii) A catalyst either or the rate of a chemical change but itself remains at the end of the reaction. iii) Formula of Iron (III) carbonate is .. c) Write balanced chemical equation for each of the following: i) NaCl + AgNO3 [5] ii) Pb(NO3)2 + KI iii) CuCO3 iv) NH3 + O2 v) N2 + H2 d) Give one word or phrase for the following: [5] i) An artificial zeolite to remove hardness of water in large amounts. ii) A substance whose solubility increases rapidly with temperature. iii) A substance whose solubility increases and then decreases with rise in temperature. iv)A phenomenon where a compound loses its water of crystallization on exposure to dry air. v) Substances that absorb moisture from the atmosphere when they are exposed to it but not enough to form solutions. e) State one relevant observation for each of the following: i) Lead nitrate is strongly heated. ii) Chlorine water is exposed to sunlight. iii) Hydrogen peroxide is exposed to sunlight. iv) Barium chloride is added to sodium sulphate solution. v) Hydrated copper sulphate crystals are heated. [5] f) Give a reason for each of the following: i) Table salt becomes sticky on exposure to humid air during the rainy season. ii) Water is called as universal solvent. iii) fused CaCl2 or conc. H2SO4 is used as a drying agent. [5] This paper consists of three printed pages.
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