CHEMISTRY · Single correct · CBSE · Chemistry · Is Matter Around Us Pure? · Is Matter Around Us Pure?
Problem
Which of the following observations, by itself, is LEAST likely to serve as evidence that a chemical change has occurred?
(a) A temperature increase is observed when two solutions are mixed.
(b) The formation of a cloudy solid when two clear solutions are combined.
(c) A solid melts to form a clear liquid at its melting point.
(d) A distinct colour change occurs after two reagents are reacted.