Which observation does not indicate that a chemical reaction has occurred?

Formation of a precipitate

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Production of gas.

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Evolution of heat and light.

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Change in total mass of substance

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Solution

The correct option is D Change in total mass of substance
During a chemical reaction there is no change in the total mass of the substance before and after the reaction and mass is conserved as the mass or energy cannot be created nor be destroyed, it can only be transferred. Rest all others indicate that a chemical reaction has occurred.

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Similar questions

The chemical reaction between quicklime and water is characterised by :
(a) evolution of hydrogen gas

(b) formation of slaked lime precipitate

(d) change in colour of the product

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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