1.

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.

Answer»

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.




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