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ICSE 10th Question Bank : Chemistry : Electrolysis

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Worksheet-Electrolysis-1 Question 1: a) Here is an electrode reaction: [Cu Cu 2+ + 2e] At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation or reduction? b) A solution contains magnesium ions (Mg2+ ) iron (II) ions (Fe2+ ) and copper ions (Cu2+). On passing an electric current through this solution which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction. c) Why is carbon tetrachloride, which is a liquid, a non-electrolyte? d) Identify the following reactions as either oxidation or reduction:(i) O + 2e O2 (ii) K e K+ (iii) Fe3+ + e Fe2+ Question 2: a) Fill in the blanks: (1) as we descend the electrochemical series containing cations, the tendency of the cations to get _______ (oxidized/reduced) at the cathode increases. The (higher/lower) _______ the concentration of an ion in a solution, the greater is the probability of its being discharged at its appropriate electrode. (iii) Cations are formed by .......... (Loss/gain) of electrons and anions are formed by .......... (Loss/gain) of electrons. (iv)Electrolysis is the passage of .................(electricity/electrons) through a liquid or a solution accompanied by a............ (physical/chemical) change. b) Explain why Copper, though a good conductor of electricity, is a non-electrolyte. c) Name the gas released at the cathode when acidulated water is electrolysed. d) Explain why solid Sodium chloride does not allow electricity to pass through. e) What kind of particles will be found in a liquid compound that is a non-electrolyte? f) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water? g) Which ions must be present in a solution used for electroplating a particular metal? h) Explain how electrolysis is an example of redox-reaction? Question 3 Choose A, B, C or D to match the descriptions (i) to (v) below. Some alphabets may be repeated. [A non-electrolyte; B strong electrolyte; C weak electrolyte; D metallic conductor ] (i) Molten ionic compound (ii) Carbon tetrachloride (iii) An aluminium wire (iv) A solution containing solvent molecules, solute molecules and ions formed by the dissociation of solute molecules. (v) A sugar solution with sugar molecules and water molecules Question 4: (a) following is the sketch of eletrolytic cell used in extraction of aluminium: Worksheet-Electrolysis1 Jaydip_Chaudhuri 1

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