Chemistry
Identify the following.
(a) Process by which impurities from metals are removed electrolytically.
(b) A gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water.
(c) An organic compound which is used as a thermometric liquid.
(d) The type of reactions alkenes undergo.
(e) A salt which on reaction with excess of ammonium hydroxide solution gives a deep blue solution
Electrolysis
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Answer
(a) Electrorefining
(b) Hydrogen chloride gas
(c) Ethanol
(d) Addition reactions
(e) Copper sulphate solution
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(2) Propanal
(3) But-2-yne
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(a) An acid is a compound which when dissolved in water forms …………… (hydronium/hydroxide) ions as the positively charged ions.
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The diagram given below shows the electrolysis of acidified water using platinum electrode. Study the diagram and answer the following.

(a) Why dil. H2SO4 is used to acidify water instead of HCl or HNO3?
(b) Write the reaction involved in the ionisation of water and sulphuric acid and name the ions that move towards the cathode and anode.
(c) Write the overall reaction for the electrolysis of acidified water and at what ratio hydrogen and oxygen are liberated at the cathode and anode.