Which is not an indicator of chemical reaction? [1 mark]
A. Change in colour
B. Change in state
C. Change in mass
D. Change in temperature

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Solution

Correct answer: Option C. Change in mass

The occurrence of a chemical reaction is indicated by various factors like change in colour, state, temperature or evolution of gas, etc. During a chemical reaction, mass remains constant. According to the law of conservation of mass, mass can neither be created nor be destroyed in a chemical reaction.

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Which of the following observations helps to determine whether a chemical reaction has taken place or not?

(i) Change in state.

(ii) Change in colour.

(iii) Change in shape

(iv) Evolution of gas.

(v) Change in temperature.

A colour change does not necessarily indicate a chemical reaction.

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