Question

Answer the following questions: Q1) Name the following: (a) The inert electrode used in the electrolysis of acidified water. (b) Electrode used as cathode in electrorefining of impure copper. (c) An electrolyte used in electroplating of an article with silver. Q2) Write a balanced chemical equation for each of the following: (a) Reaction of excess ammonia with chlorine. (b) Reaction of carbon powder and concentrated nitric acid. (c) Reduction of hot copper oxide to copper using ammonia gas. Q3) State one relevant reason for each of the following: (a) Graphite anode is preferred to platinum in the electrolysis of molten lead bromide. (b) Concentrated nitric acid appears yellow, when it is left for a while in a glass bottle. Q4) a) The percentage composition of a gas is: Nitrogen 82.35%, Hydrogen 17.64% Find the empirical formula of the gas. [Given relative atomic masses of N=14, H=1] b) A compound with empirical formula AB has vapour density three times its empirical formula weight. Find its molecular formula. Q5) Match the gases given in Column –I to the identification of the gases mentioned in Column-II. Column - I Column – II (a) Hydrogen sulphide (i) Turns acidified potassium dichromate solution green. (b) Nitric oxide (ii) Turns moist lead acetate paper silvery black. (c) Sulphur dioxide (iii) Turns reddish brown when it reacts with oxygen. Page1/2 Q6) During the electrolysis of Copper(II) sulphate solution using platinum electrodes: (a) State what do you observe at the cathode. (b) State the change noticed in the electrolyte.

Answer 1

Answer:

a) acidified water.

b) The anode, positive electrode, is the impure metal to be purified. The cathode, negative electrode, is the electrode at which the pure metal will be deposited.

c)sodium argentocyanide

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