Question 9
Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
(d) A gas may be evolved.
The explanation for the correct option:
Option(a)Heat may be given out but never absorbed.
The explanation for the incorrect option:
(b) Sound may be produced.
(c) A color change may take place.
(d) A gas may be evolved.
These all are indications of a chemical reaction. when these things happen we can confirm that there is a chemical change takes place. Hence, these all are related to a chemical reaction.