Why cannot a chemical reaction be confirmed on the basis of colour change alone?
Answer and explanation
Correct answer: Because colour change may also result from physical mixing or dissolution; evidence of formation of a new substance is needed.
A colour change can be an indication of a chemical reaction, but it is not conclusive by itself. For example, mixing coloured substances or dissolving a coloured substance can change the colour without forming a new substance. Confirmation of a chemical reaction requires evidence of a change in composition or formation of a new substance. Option B is incorrect because colour change does not always prove a chemical change.
Frequently asked questions
What is the correct answer to this question?
Because colour change may also result from physical mixing or dissolution; evidence of formation of a new substance is needed.
Why is this the correct answer?
A colour change can be an indication of a chemical reaction, but it is not conclusive by itself. For example, mixing coloured substances or dissolving a coloured substance can change the colour without forming a new substance. Confirmation of a chemical reaction requires evidence of a change in composition or formation of a new substance. Option B is incorrect because colour change does not always prove a chemical change.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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