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Question
Give one example each of which illustrates the following characteristics of a chemical reaction:
change of colour
Solution
When blue coloured copper sulphate reacts with hydrogen sulphide gas, a black coloured substance copper sulphide is formed.
\[\ce{\underset{\text{copper sulphate solution, blue}}{CuSO4} + \underset{\text{hydrogen sulphide}}{H2S} ->\underset{\text{copper sulphide black solid}}{CuS} +\underset{\text{sulphuric acid}}{H2SO4}}\]
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