To Know about colour Change after any chemical reaction.
How to know about colour Change after any chemical reaction as this kinds of questions are ask in the board examination.How to know about colour.
You need to remember these 3 things for these kinds of questions.
(i) Identify the chemical reaction occurring in the given question.
(ii) Identify the change in oxidation numbers of elements.
(iii) You must remember the colour of some common compounds. These things you can collect if and only if you study from ncert book.