Which of the following is an example of a combustion reaction?

a. mixing of acid and base
b. photosynthesis in plants
c. lighting of a matchstick
d. reacting sodium and chlorine

Option c = Lighting of matchstick

Explanation:

The lightning of match stick is combustion reaction.  The chemical potassium chlorate, glue, sulfur and starch is present on the tip of match stick. When the match stick catch the fire combustion process occur and heat is released.

Photosynthesis in plant:

It is the reaction in which plants used the carbon dioxide and water and convert it into sugar and oxygen in the presence of light.

6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂

Mixing of acid and base:

When an acid react with base it form the salt and  water. The reaction is also called neutralization reaction because both neutralize each other.

In neutralization reaction equal amount of acid and base react to neutralize each other and equal amount of water and salt are formed. When pH does not reach to 7 its means there is less amount of one of reactant which is not fully neutralize.

Reacting of sodium and chlorine

The reaction of sodium and chlorine is the formation of  ionic compound. It is formed by the complete transfer of electron from sodium to chlorine atom and form ionic bond. In this ionic compound sodium carry positive charge and chlorine carry negative charge there is attraction between these oppositely charged atoms.

lighting of a match stick

Explanation: