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TOUGH PAPER 2017 Class X Subject CHEMISTRY TIME : 1 HOUR 30 MINUTES M.M.80 SECTION A (All questions in this section are compulsory) (40 MARKS) Q.1 (a) Mr. Ramu wants to electroplate his key chain with nickel to prevent rusting. For this electroplating (i)Name the electrolyte used (ii)Name the cathode (iii)Name the anode (iv)Give the reaction at the cathode (v)Give the reaction at anode (5) (b) Name the following (5) (i)a metal which is liquid at room temperature (ii)The process of heating an ore to a high temperature in the presence of air (iii)The compound formed by the reaction between calcium oxide and silica (iv)A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium (v)Name an allotrope of a non metal that allows electricity to pass through it (c) A Sodium carbonate, B Sodium hydrogen carbonate, C Zinc carbonate (i) Choose the salt for the following observations from A, B and C (1) A carbonate which on heating decomposes to form water and carbon di oxide (2) A carbonate which decomposes on heating to give carbon di oxide only (3) A carbonate which does not decompose on heating (5) (ii) Write balanced chemical equations for the following (1)Action of dilute nitric acid on sodium hydrogen carbonate (2)Action of dilute hydrochloric acid on zinc carbonate (d) Three colourless gases P, Q and R can reduce copper (ii) oxide to copper metal (5) (i) In case of P the products of reaction are copper metal and water, identify gas P (ii) In case of Q the products are copper metal and carbon di oxide, identify gas Q and write a balanced chemical equation of reaction of Q with copper (ii) oxide (iii)In case of R the products of reaction are copper metal, water and nitrogen gas, identify gas R and write a balanced chemical equation of reaction of R with copper (ii) oxide
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