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2013 pupil performance analysis (MY IDEAL - ROHIT SHARMA)

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Ashutosh Rath
De Paul School, Berhampur

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CHEMISTRY SCIENCE Paper - 2 II. (a) ANALYSIS OF PERFORMANCE From the list given below, select the word(s) required to correctly complete blanks (i) to (v) in the following passage. The words from the list are to be used only once. Write the answers as (a) (i), (ii), (iii) and so on. Do not copy the passage. [ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide, precipitate, salt, water]: (i) A solution M turns blue litmus red, so it must contain (i) _______ions; another solution O turns red litmus blue and hence, must contain (ii) ______ ions. (ii) When solutions M and O are mixed together, the products will be (iii) _________ and (iv) ________. (iii) If a piece of magnesium was put into a solution M, (v) ________ gas would be evolved. (b) [5] Identify the gas evolved in the following reactions when: (i) sodium propionate is heated with soda lime. (ii) potassium sulphite is treated with dilute hydrochloric acid. (iii) Sulphur is treated with concentrated nitric acid. (iv) a few crystals of KNO3 are heated in a hard glass test tube. (v) concentrated hydrochloric acid is made to react with manganese dioxide. (c) [5] State one appropriate observation for each of the following: (i) Concentrated sulphuric acid is added drop wise to a crystal of hydrated copper sulphate. (ii) Copper sulphide is treated with dilute hydrochloric acid. (iii) Excess of chlorine gas is reacted with ammonia gas. (iv) A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution. (v) Electricity is passed through molten lead bromide. 153 [5]

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