Which of the following is an essential condition for a combustion reaction ? a. oxygen is a product b. oxygen is a reactant c. carbon dioxide is a product d. carbon dioxide is a reactant

Option (b) is the correct answer.

Explanation:

A combustion reaction is defined as the reaction in which a substance chemically reacts in the presence of oxygen.

A combustion reaction is always exothermic in nature as heat is released. Also, carbon dioxide and water will be produced in a combustion reaction.

For example,

Therefore, we can conclude that an essential condition for a combustion reaction is that oxygen is a reactant.

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.