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Question

Identify the following : [5 MARKS]
(a) black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases which when mixed produce a white solid.
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved
 


Solution

Each Part: 1 Mark

(a) Copper(II) Oxide on reaction with HCl gives blue coloured solution of copper (II) chloride.
CuO(s)+2HCl(aq)CuCl2(aq)+H2O(l)

(b) HCl and NH3 are the colourless gases which when mixed produce a white solid NH4Cl at room temperature.
NH3(g)+HCl(g)NH4Cl

(c) HCl is formed by the combination of hydrogen gas and chlorine gas.
H2(g)+CI2(g)2HCI(g)

(d) Silver chloride is soluble in excess of ammonium hydroxide.
AgCl(s)+2NH4OH(aq)[Ag(NH3)2]Cl

(e) Gold can easily be dissolved in aqua regia. Aqua regia is a mixture of 3 parts conc. HCl and 1 part conc. HNO3

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