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ICSE Board Exam 2017 : Chemistry

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Vikash Kumar
Rajendra Vidyalaya (RV), Jamshedpur
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a. The following questions are pertaining to lab preparation of HCl gas:(i) Write the equations for its preparation mentioning the conditions required. (ii) Name the drying agent and justify the choice. (iii) State a safety precaution you would take during the preparation of HCl acid. b. An element L consists of molecules. (i) What type of bonding is present in the particles that make up? (ii) When L is heated with iron, it forms FeL. What chemical term would you use to describe the change undergone by L? c. From the list given below, choose the most appropriately fits the description given in the following:- (AgCl,MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2) (i) Deliquescent salt (ii) An insoluble salt (iii) On heating this salt, a brown coloured gas is evolved d. Give balanced equation for the following conversions:(i) Ethanoic acid to ethyl chloride (ii) Calcium carbide to ethyne (iii) Sodium acetate to methane e. Using their structural formula identify the functional group:(i) Di methyl ether (ii) Propanoic acid f. For each of the substances listed below, describe the role played in the extraction of aluminium:(i) Cryolite (ii) Sodium hydroxide (iii) Graphite g. Explain why:(i) In the electrolysis of alumina using Hall Heroult s process the electrolyte is covered with powdered coke. (ii) Iron sheets are coated with zinc during galvanization. h. Match the ions with their coloured precipitated when NaOH solution is added to the solution containing :- lead ion, ferrous ion, zinc ion, ferric ion, copper ion, calcium ion. i. During electrolysis of copper (II) sulphate solution using platinum as cathode and carbon as anode. (i) What do you observe at cathode and anode? (ii) What change is noticed in the electrolyte? (iii) State the reactions taking place at cathode and anode. j. Answer the following questions:(i) What is the difference between roasting and calcination? (ii) Name the metal which is found abundantly in earth s crust. k. Show the formation of hydronium ion from water and hydrogen ion. l. Define isomerism. m. Write the equations for the following reactions:(i) Sulphur is heated with conc. H2SO4 acid. (ii) Zinc oxide is treated with NaOH solution. (iii) Ammonium chloride is heated with caustic soda. (iv) Conc sulphuric acid is poured over sugar. (v) Magnesium sulphate solution is mixed with barium chloride solution. n. An organic compound with VD 94 contains C=12.67%, H=2.13% and Br=85.11%. find the molecular formula. o. Calculate the mass of :(i) 1022 atoms of Sulphur (ii) 0.1 mole of carbon dioxide p. Calculate the volume of 320gm of sulphur dioxide at STP. q. Calculate the volume of oxygen required for the complete combustion of 8.8gm of propane. r. State two relevant observation for each of the following:(i) Ammonium hydroxide solution is added to copper sulphate solution in small quantity and then in excess. (ii) Ammonium hydroxide solution is added to zinc sulphate solution in small quantity and then in excess. (iii) Lead nitrate crystals are heated in a test tube. s. The elements of one short period of the periodic table are given below in order from left to right :- Na, Mg, Al , P , S , Cl , Ar (i) Two which period do these elements belong? (ii) Name the missing element and place it in its own position. (iii) Write the elements in the ascending order of ionization potential. (iv) Which of the following above elements would form polar covalent hydroxide and why? t. P + 5HNO3 H3PO3 + H2O+ 5NO2. If 93gm of phosphorus was used in the reaction, calculate:(i) Number of moles of phosphorus taken (ii) The mass of phosphoric acid formed (iii) The volume of nitrogen dioxide produced at STP. u. Give the structural formula of the following:(i) Methanoic acid (ii) Ethanal (iii) Ethyne (iv) Neo pentane (v) 2-Methyl propane v. Write balanced equation for the following reactions:(i) Sodium thiosulphate reacts with dil hydrochloric acid (ii) Calcium bicarbonate reacts with dilute hydrochloric acid (iii) Dilute suphuric acid is poured over sodium sulphite. (iv) Lead nitrate solution is added to sodium chloride solution. (v) Zinc is heated with sodium hydroxide solution.

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