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http://www.icseguess.com/ 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 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: 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: 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. www.icseguess.com Other Educational Portals www.cbseguess.com | www.ignouguess.com | www.aipmtguess.com | www.aieee.com | www.niosguess.com | www.iitguess.com RAHUL CHEMISTRY CLASSES,TURNER ROAD,DEHRADUN Page 1 5 5 5 http://www.icseguess.com/ (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. 5 5 5 5 5 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) (b) 2Pb(NO3)2 2PbO+4NO2+O2 Calculate; (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 www.icseguess.com Other Educational Portals www.cbseguess.com | www.ignouguess.com | www.aipmtguess.com | www.aieee.com | www.niosguess.com | www.iitguess.com RAHUL CHEMISTRY CLASSES,TURNER ROAD,DEHRADUN Page 2 http://www.icseguess.com/ Q.3. (a) (i) What changes will you observe at cathode, anode and in electrolyte during the electrolysis of copper sulphate solution with copper electrode? 5+3+2 (ii) Give equations taking place at cathode and at anode in (a) (i) above (b) Classify the following as strong electrolytes, non-electrolytes and weak electrolytes: Sugar solution, Solid lead bromide, Molten Sodium chloride, Carbon dioxide solution, Acetic acid, Sodium sulphate solution. (c) (i) State Modern periodic law. (ii) In Group 1 and Group 17 elements, which is likely to be metallic in nature? Q.4. (i) Name the compound used in preparation of Hydrogen chloride gas along with rock salt. 7+3 (ii) Write the balanced chemical equation for the reaction taking place above. (iii) How is hydrogen chloride gas collected and dried (iv) What does the method of collection suggests about the density of the gas? (v) If hydrogen chloride gas is passed through water. What is the nature of the solution obtained and what change will it show towards litmus? (b) (i) Name the process by which ammonia is prepared from its elements. Write equation. (ii) Which property of Ammonia is demonstrated by fountain experiment. Q.5. (a) A piece of limestone i.e. CaCO3, dissolves when first shower of rainfall on it. What chemical in the rain brings about the dissolution? Also give the equations for the formation of the compound. 4+4+2 (b) (i) For what purpose Ostwald s process is used ? (ii) During laboratory preparation of nitric acid, the temperature of the reaction must be maintained below 200 0C. Why? (iii) Name the salts formed when nitric acid reacts with metallic oxide. (c) What will you observe when Ammonium Hydroxide is added to chemical nitrate solution? Q.6.(a) Name the organic compound prepared by each of the following reactions: (i) CH3 COONa + NaOH CaO (ii) CaC2 + H2O (iii) C2H5Br + KOH (alc) (iv) C2H5Br + KOH (aq) (v) C2H5OH + CH3COOH Con.H2SO4 [5+3+2] (b) Name the process by which sulphuric acid is manufactured. Write balanced chemical equation for the reaction which takes place in the presence of a catalyst. (c) Give one equation for each to show that Sulphuric acid acts as: www.icseguess.com Other Educational Portals www.cbseguess.com | www.ignouguess.com | www.aipmtguess.com | www.aieee.com | www.niosguess.com | www.iitguess.com RAHUL CHEMISTRY CLASSES,TURNER ROAD,DEHRADUN Page 3 http://www.icseguess.com/ (i) Oxidizing agent (ii) Dehydrating agent (iii) Least volatile acid Q.7. (a) (i) Name the most common ore of Aluminium. 4+6 (ii) Name the process by which ore is purified. (iii) Name the gas liberated at anode during its electrolytic reduction. (iv) Give equations taking place at cathode and at anode. (b) (i) Name two metallic oxides reduced by carbon. (ii) Metallic oxide reduced by Carbon monoxide. (iii) Give balanced chemical equations for the reaction taking place in (b) (i) and (b) (ii). Paper Submitted By: Name Arvind kumar chaudhry Email arvindkumarchaudhry@yahoo.com Phone No. 9259638876 www.icseguess.com Other Educational Portals www.cbseguess.com | www.ignouguess.com | www.aipmtguess.com | www.aieee.com | www.niosguess.com | www.iitguess.com RAHUL CHEMISTRY CLASSES,TURNER ROAD,DEHRADUN Page 4
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