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Give One Example Each of Which Illustrates the Following Characteristics of a Chemical Reaction: Change of Colour - ICSE Class 8 - Chemistry

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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.

`CuSO_4`          +            `H_2S`                 `→`          CuS           +        `H_2SO_4`

(copper sulphate        (hydrogen                  (copper sulphide        ( sulphuric acid )

solution , blue)           sulphide)                   black solid )

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Solution Give One Example Each of Which Illustrates the Following Characteristics of a Chemical Reaction: Change of Colour Concept: Types of Reactions - Combination.
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