Which of the following is incorrect for a chemical reaction?

A colour change may take place

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Heat may be given out but never absorbed

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A gas may be evolved

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Sound may be produced

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Solution

The correct option is D Heat may be given out but never absorbed
Heat can be given out $-$ exothermic reaction
Heat can also be absorbed $-$ endothermic reaction

$∴$ statement $B$ is incorrect for a chemical change.

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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.

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F e S O_{4} (a q) + C H_{3} C O O H (a q) + C (a q) \to [F e (H_{2} O)_{5} N O] S O_{4}

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Which of the following is incorrect for a chemical reaction?

The correct option is D Heat may be given out but never absorbedHeat can be given out − exothermic reactionHeat can also be absorbed − endothermic reaction∴ statement B is incorrect for a chemical change.

The correct option is D Heat may be given out but never absorbed
Heat can be given out $-$ exothermic reaction
Heat can also be absorbed $-$ endothermic reaction

$∴$ statement $B$ is incorrect for a chemical change.