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If gas evolves in an unknown reaction but colour does not change what is the most careful conclusion?

Answer and explanation

Correct answer: Gas formation may indicate a chemical reaction; other observations should also be checked for confirmation

A colour change can be a sign of a chemical reaction, but it is not necessary in every chemical reaction. Formation of a gas may suggest that a new substance has formed, so it can indicate a chemical reaction. However, bubbles alone are not conclusive because a physical process such as boiling can also produce bubbles. Check additional observations, such as temperature change, precipitate, odour, or the identity of the gas. Exam tip: Do not treat a single observation as conclusive evidence.

Related tags

Class 10 ScienceChemical ReactionsChemical EquationsGas EvolutionIndicators Of ReactionScientific Observation

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