During a combustion reaction which of the following are true? Question 2 options:

Energy is not released

The law of conservation of energy is in effect

They do not involve hydrocarbons

Oxygen is NEVER a reactant in the reaction

answer: option (a) is the correct answer.

explanation:

the measurement of hydrogen ions in a solution is known as ph.

if ph of a solution is less than 7 then the solution is acidic. if ph of a solution is greater than 7 then the solution is basic.

when the ph of a solution equals 7, then the solution is considered as neutral.

the ph of pure water is 7, therefore, it means that concentration of hydronium ions equals that of hydroxide ions.