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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. |
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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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