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Guess paper SUBJECT CHEMISTRY CLASS X Time-2 hours MM-80 SECTION I (40 MARKS) (ATTEMPT ALL QUESTIONS) Q.1(a). The following questions are related to the properties and uses of the gases. Name the gas that 5 i. is basic in nature ii. is having burning sulphur smell iii. is having rotten egg smell iv. gives white precipitate with silver nitrate solution v. turns Nessler s reagent brown vi. Relights the glowing splinter vii. turns freshly prepared ferrous sulphate solution brown black viii. is used as a refrigerant ix. is a greenish yellow coloured gas x. is used for manufacture of urea (b) The following questions are related with the properties of metals and non metals: 5 Name: i. non metal, good conductor of electricity ii. liquid non - metal iii. metal used for galvanization. iv. a yellow non-metal v. atomicity of metal vi. bonding present in metallic chlorides. vii. bonding present in non-metallic chlorides. viii. during electrolysis, on which electrode, metals are obtained? ix. during electrolysis, on which electrode, non-metals are liberated? x. property by which metals can be beaten to sheets. (c) Name the organic compounds which can fit into description given below: 5 i. A carboxylic acid containing two carbon atoms ii. Hydrocarbon containing only carbon-carbon single bond. iii. Hydrocarbon containing at least one carbon-carbon double bond. iv. Hydrocarbon containing at least one carbon-carbon triple bond. v. Hydrocarbon which contributes towards greenhouse effect. (d) Name the property in each case: i. Salts when exposed to atmosphere absorb moisture and become wet. ii. The unique property by which elements link to each other either to form long chain or ring structure. iii. The property by which metals can be drawn into wires. iv. Salts, when exposed to atmosphere, absorb moisture and get converted into the saturated solution. v. Hydrated salts, when exposed to atmosphere, lose their water of crystallization and crumble to form powder. (e) Write balanced chemical equations for the following: i. Lead nitrate is heated ii. Nitric oxide is oxidized iii. Red hot iron reacts with steam. iv. Ammonia reacts with sulphuric acid v. Nitric acid is heated (f) Calculate i. Number of moles occupied by 32 g of sulphur dioxide. ii. Number of molecules occupied by 32 g of sulphur dioxide. iii. Volume occupied by 32 g of sulphur dioxide at S.T.P iv. If gas X has relative molecular mass as 44. What is its vapour density? (g) Name the gas evolved when, i. Calcium carbide is hydrolyzed ii. Sodium acetate reacts with soda lime iii. Ammonium chloride is warned with caustic soda. iv. Ethene is hydrogenated v. Ammonium nitrite is heated (h) Write balanced chemical equation for (g) above. SECTION II (40 MARKS) (ATTEMPT ANY FOUR QUESTIONS) Q.2. (a) A hydrated salt has the following percentage composition: 3+3+4 Fe = 20.14%, S = 11.51%, O = 23.02%, H2O = 45.32%. Calculate the simple formula of the hydrated salt. (H = 1, O = 16, S = 32, Fe = 56) 2PbO+4NO2+O2 Calculate; (b) 2Pb(NO3)2 (i) Mass of lead nitrate required to produce 23.3 g Pbo (ii) volume of NO2 an d O2 prodeuced at STP (c) Calculate the percentage of carbon in (i) Ethylene C2H4 (ii) Ethyne C2H2 5 5 5 5 5

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