i) An article X is to be plated with Nickel. Answer the following questions: c) Write the reactions that take place at cathode and anode.

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Aubrey Heath
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1 Work sheet Electrolysis i) An article X is to be plated with Nickel. Answer the following questions: a) Name the anode and cathode used. b) Name the electrolyte used. c) Write the reactions that take place at cathode and anode. d) State the condition in which a uniform coating of Nickel could be obtained on the article X. ii) iii) iv) Why is it necessary to add acid to water before proceeding with the electrolysis of water? Explain the factors that influence the selective discharge of ions. How is the electrolysis of aqueous NaCl different from molten NaCl? v) Name the following: a) A salt which is a weak electrolyte b) A base which is not an alkali c) An inert electrode and an active electrode d) The metals extracted by electrolysis e) What is the stste of the compounds from which these metals are extracted. vi) Name all the particles present in a) Sodium chloride solution b) Molten sodium chloride

2 c) Sulphurous acid d) Carbon tetrachloride vii)in which electrode oxidation and reduction take place during electrolysis. viii) What are the applications of electrolysis? ix) An aqueous solution contains OH -,NO 3 -, SO 4-2 ions. Name : a) the ion which will migrate toward anode. b) the product obtained at anode. x) Write equations for the reactions taking place at cathode and at anode during the electrolysis of : a) Acidified water with inert electrodes b) Nickel sulphate solution with nickel electrodes c) Copper sulphate solution with platinum electrodes d) Molten lead bromide with inert electrodes e) Concentrated NaCl solution using platinum electrodes. f) Copper sulphate solution with using copper electrodes. g) Dilute NaCl solution using platinum or graphite electrodes. xi)explain the following: a) Copper is a good conductor of electricity but it is non-electrolyte. b) During the electrolysis of an aqueous solution of NaCl,H + ions are reduced at cathode and not Na + ions. c) A solution of sugar does not conduct electricity but a solution of sodium chloride is a good conductor. xii) Give two examples in each case:

3 a) Metallic conductor b) Strong electrolyte c) Non-electrolyte d) Weak electrolyte xiii) With reference to electroplating,answer the following : a) Why are articles electroplated? b) During electroplating,explain why: 1. a direct current is used. 2. a small current should be used for a longer time. 3. the articles to be electroplated should always be placed at the cathode. 4. the anode must be made of the metal with which the article has to be plated. xiv) Electrolysis is used in the purification of metals.name a) the anode b) the cathode c) the electrolyte,you would use to get pure copper from impure copper x x-x-xx

4 Organic chemistry work- sheet i) a) State first two members of the homologous series of alkenes and alkynes( give theircondensed formula). b)write structural formulae of the following : 1. Ethene 2. Ethanol 3. Methanal 4. Ethanoic acid 5. 2-Butyne ii) What will you observe when? a) Ethene is passed through bromine solution in carbon tetrachloride. b) Sodium is dropped in methanol. c) Ethene is passed through alkaline potassium permanganate solution. ii) Give one example( chemical equation) for each of the following with conditions: a) Hydrogenation b) Dehydration c) Substitution reaction d) Addition reaction e) Esterification reaction f) Dehydrohalogenation reaction iii) Carry out the following conversions: a) CaC 2 to C 2 H 2 b) C 2 H 5 OH to acetic acid c) Methane to methanol d) Ethane to ethanal

5 e) Ethyne to ethane iv) How are saturated hydrocarbon different from unsaturated hydrocarbon chemically? v) What is the common feature of ethylene and acetylene? vi) Which gas is used for artificial ripening of fruits. vii) Name one chloro derivative of methane which has no hydrogen. viii) Write balanced chemical equation for the laboratory preparation of : a) Methane b) Ethene c) ethanol d) ethyne ix) What is isomerism?give the possible structures of pentane along with their IUPAC names. x) What is added to make ethanol unfit for drinking? xi) Give two uses for each of ethyl alcohol and acetic acid? xii) What is a) glacial acetic acid b) denatured alcohol xiii) a) Write the equation for the preparation of ethylene from ethyl alcohol b) Write the general formula for a saturated hydrocarbon and give one example of a saturated hydrocarbon with its structural formula. c) Name a compound which will give acetylene gas when treated with water. xiv) Name the following: a) Formed by the dehydration of ethanol by conc sulphuric acid. b) Which forms chloroform on halogenation in the presence of sunlight? c) Which decolorises bromine solution in carbon tetrachloride?

6 d) A solid which can be used instead of conc. sulphuric acid to prepare ethene by the dehydration of ethanol. e) The alcohol,aldehyde and acid formed when ethane is oxidized. f) The acid which contains four hydrogen atoms in it. g) An unsaturated hydrocarbon used for welding purposes. h) An organic compound whose functional group is carboxyl. xv) How would you distinguish chemically between a double and a triple bond? xvi) Write a balanced chemical equation for the complete combustion of ethane. xvii) Write a chemical reaction for the interaction of acetic acid with sodium hydrogen carbonate solution? xviii) Write the equation for the reaction of bromoethane and an aqueous solution of sodium hydroxide. xix) Name the addition product formed between ethene and water. xx) Compound A is bubbled through bromine dissolved in carbon tetra chloride and the product is CH 2 Br-CH 2 Br. A Br 2 / CCl CH 2 Br-CH 2 Br. i) Draw the structural formula of A. ii) What type of reaction has A undergone? iii) What is your observation? iv) Name the compound formed when steam reacts with A in the presence of conc. sulphuric acid x-----x x x x

MC 17 C SECTION - I (40 marks) Compulsory : Attempt all questions from this section.

MC 17 C SECTION - I (40 marks) Compulsory : Attempt all questions from this section. Question 1. (a) SECTION - I (40 marks) Compulsory : Attempt all questions from this section. Choose from the following list of substances, as to what matches the description from to given below : [Bronze,