In an unknown reaction, an insoluble white solid forms, but no noticeable temperature change is observed. What is the most appropriate conclusion?
Answer and explanation
Correct answer: A precipitation reaction is likely
The formation of an insoluble solid usually indicates the formation of a precipitate, so a precipitation reaction is the most likely conclusion. No noticeable temperature change does not prove that no reaction occurred; in some reactions, the thermal change may be too small to observe easily. Therefore, option B is incorrect, and a white precipitate alone cannot establish that the reaction is definitely exothermic or a decomposition reaction.
Frequently asked questions
What is the correct answer to this question?
A precipitation reaction is likely
Why is this the correct answer?
The formation of an insoluble solid usually indicates the formation of a precipitate, so a precipitation reaction is the most likely conclusion. No noticeable temperature change does not prove that no reaction occurred; in some reactions, the thermal change may be too small to observe easily. Therefore, option B is incorrect, and a white precipitate alone cannot establish that the reaction is definitely exothermic or a decomposition reaction.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
