Question

Burning is always accompanied by __________.

• A. production of heat
• B. a colour change
• C. formation of a gas
• D. all of the above

Answer 1

The correct option is D all of the above

Burning is always accompanied by

$\left(i\right)$ Production of heat $-$ because burning is an exothermic reaction hence heat is evolved.

$\left(ii\right)$ Colour change same flames are produced during burning, hence there is colour change eg. yellow colour of the flame.

$\left(iii\right)$ Burning usually leads to the production of gas and water. The gas evolved is ${CO}_2$.

$Substance\underrightarrow{Burning}Ashes+{CO}_2+H_{2}O$