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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.

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