Question

Which of the following statements is incorrect for a chemical reaction?


Heat may be given out but never absorbed

Sound may be produced

A color change may take place

A gas may be evolved​

Answer 1

Answer:

a colour change may take place

Answer 2

Answer:

Wrong statement

Explanation:

Heat may be given out but never absorbed.

In a reaction where heat is absorbed is known as an endothermic reaction whereas in a reaction where heat is given out is known as an exothermic reaction.

Endothermic reaction ex.-

2NaHCO3- heat-Na2CO3 +H2O+CO2 - heat

( -) sign implies that heat is absorbed.

Exothermic reaction ex.-2Mg + O2 - heat- 2MgO + heat

Here (+) sign implies that heat is given out.