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ST. TERESA'S SCHOOL, BOLPUR Pre-Board Examination: 2021-22 Chemistry Class-X Time:1:30hrs Marks: 40 Section-A (Attempt all the question) Question H Choose the correet answers to the question from the given options.(Do not copy write the correet Molecular formula of cryolite the question. a) NaiAlF answer only.) b)ALO,21,0 of the following is false? i)Which A) Common salt is used in the B) P2O5 is not used C) is a) A and B as a d) Al,O1.H,0 c) Al,O. preparation drying agent (10) of HCI gas. for HC in the manufacturing of HCI gas sulphuricacid employed b) A and C c)Only C. d) A ,B and C j The temperature at which the catalytic oxidation of ammonia is carried out a) 200 C. b) 800 C. c)1000 C. d) 500 C ) Reaction of copper with dil. and conc. nitric acid yield... a) NO and NO; b) NO; and NO and. c) NO and NO gases respectively. d) NO and N; Which of the following is produced during the contact process? b) oleum a) ammonia c) nitric acid d) oxygen gas How many single covalent bonds are present in cyclohexane? a) y 20 b) 18. c) 24 d) 15 n-propyl alcohol and isopropyl alcohol shows a) Chain isomerism b) position isomerism c) functional group isomerism d}none of these yif)Al(OH)3 is heated at 1000 C to produce a) NaAlO b) AlLO,.2H,0 c)Al,O d) NaOH K) Hydrochloric acid forms a constant boiling mixture at a) 500 C. The b) 110 C. fountain is observed a) Partial vacuum. c)-22 C d)63 C because ammonium hydroxide creates..inside the b) hole c)space flask in fountain exper d) nitrogen gas Section-B Attempt any three questions Question:2 Define: a) 1)Homologous series. 11) Catenation Draw the structural formula of Butanal ii) Ethanoic acid ii)2- Butanol b) Name the compound formed when i) Ethane react with oxygen at 475 Kelvin and 120 atmospheric pressure in presence a catalyst. i) Magnesium oxide react with hydrochloric acid. ii) Manganese react with very dilute nitric acid. 2) (3) of copper as uat Question :6pWhich property of sulphuric acid with. jEthanol take Pce acid is shown d) carbon in tan-tierou by s process. (2) the reactions of concentrated sulphuric Fill in the blanks: (2) Concentrated nitric acid react with to form sulphur ....(sulphurdioxide, sulfuric acid.) Dilute sulfuric acid react with Sodium hydrogen sulfite to form..(Sulphur dioxide hydrogen sulphide) Give the balanced chemical YAction Iron ) j of dilute equation hydrochloric for cach of the acid on sodium is heated with hydrogen chloride. Action of hydrochloric acid on Sodium Name the following: following reactions (3) sulphite. bicarbonate. A n explosive formed when ammonia react with excess of chlorine. The colour of a gas evolved when concentrated hydrochloric acid is heated with (3) Jmanganese dioxide. ) Electrolyte used for Question :4 Write the electroplating an article with silver. constituent elements of duralumin and magnalium. (2) PName one main ore of iron and zinc. (2) Ammonia is used in Ostwald process, Name the catalyst used 4) N a m e the oxidizing agent used in catalytic chamber. Ai) What is the ratio of ammonia and air taken in this process? i)Write the balanced reaction that takes place in catalytic chamber. Write the optimum temperature and promoter required in Haber's process (2) Question: 5 a) Identify the following: 3) 1) The compound added to pure alumina to lower the fusion temperature during the ii) A black metallic oxide which react with concentrated hydrochloric acid to give a electrolytic reduction of alumina. coloured solution. ii) A white solid is formed when two colourless gases are mixed. b) what do you observe when i) Dilute hydrochloric acid is reacted with sodium thiosulphate. ) Ammonia is passed over heated lead monoxide. 8) ii) Bromine in ccl4 is added to ethene. c)Write the structural formula of chain isomers of butane. d) write the balanced reaction of the following reactions, when (2) (2) i) Ethene is oxidised with alkaline KMnO4 at room temperature. i) Mixture of methane and oxygen is passed through heated molybdenum oxide Questions AWrite three diferences between saturated and unsaturated organic compounds. bAluminium is extracted by Hall- Heroult's process. 3) 3) Name the clectrolyte used jWhat temperature is required to keep the clectrolyte in molten state? iWhy the powdered Coke is sprinkled over the surface of electrolyte Why is funnel arrangement used in the preparation of hydrochloric Write the IUPAC name: CH-CH(Br)-C(CI(CH,)-CH,OH acid? CH,-CH-C(CH1-CH,-CH (2) (2)
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