Question

Which is not true for combustion reactions?

a. they always occur in the presence of oxygen
b. they produce carbon dioxide and water
c. they usually require a lot of energy to form products
d. a candle burning is an example of one ​

Answer 1

They usually require a lot of energy to form products

Step-by-step explanation:

• Energy may not be reasonable source.
• Oxygen and hydrocarbon is enough to produce the products .

Petroleum products, Carbon and hydrocarbons are also necessary