Consider the following
1. Change in state
2. Change in temperature
3. Change in colour
4. Evolution of a gas
Which of the above observations leads to a chemical reaction?
1, 3 and 4
2, 3 and 4
1, 2 and 3
1, 2, 3 and 4
Explanation:
Refer to NCERT, Chemical Reactions and Equations
Refer to NCERT, Chemical Reactions and Equations