adha took a light green coloured chemical substance 'V' in a dry boiling
tube and heated it over the flame of the burner. On strong heating a
reddish brown substance 'W' is formed alongwith evolution of two gases
'X','Y' having suffocating odour.Identify 'V','W','X','Y' and write the chemical
formula of each.Write the balanced chemical equation involved.
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The question describes an experiment similar to the decomposition of copper(II) carbonate ( CuCO3 ) which is when heated in decomposes into carbon dioxide gas ( CO2 ) and copper(II) oxide ( CuO ) according to the following decomposition reaction:
CuCO3(g→CO2(g)+CuO(s)
Therefore, the green substance is a compound and the change is a chemical change since giving off a gas is one of the several indication of a chemical change that include:
Gas evolution
Formation of a precipitate
Evolution of heat
Odor
Color change
etc.
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