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My Rich Dad s Academy Class X Subject Chemistry SECTION A Question 1 (a) (i)What volume of oxygen is required to burn completely a mixture of 22.4 dm3 of methane and 11.2 dm3 of hydrogen into carbon dioxide and steam? Equations of the reactions are given below (Assume that all volumes are measured at S.T.P ) CH4 + 2O2 CO2 + 2H2O 2H2 + O2 2H2O (ii) The gases hydrogen oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular mass. Given 8g of each gas at STP, which gas will contain the least number of molecules and which gas the most? [5] (b) Match the description in column X with the appropriate substance in column Y. Write down the number of the description with the letter of the substance. The first one has been done for you. X Y 1. A gas whose solution in water is alkaline A. Hydrogen sulphide 2. A solution which bleaches by oxidation B. Hydrochloric acid 3. An alloy of copper and zinc C. Lead bromide 4. A gas which smells of rotten eggs D. Sulphur 5. A liquid which is a non-electrolyte E. Fluorine 6. A solid which undergoes Electrolysis when molten F. Brass 7. A gas formed by burning sulphur G. Ammonia 8. A solution which gives chlorine on oxidation H. Sulphur dioxide 9. An element existing in two crystalline forms I. Ethanol 10. A gas which is the most electronegative among all the elements J. Concentrated nitric acid 11. A solution which gives nitrogen dioxide K. Chlorine water L. Dilute nitric acid M. Bronze The first answer is 1-G. [10] (c) (i) How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution? (ii) Copy and complete the following table which refers to the action of heat on some carbonates [5] Carbonate Colour of residue on cooling
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