Question

When most fuels burn, water and carbon dioxide are the two main products. However, water and carbon dioxide are not the products of all combustion reactions. Which will not form water and carbon dioxide when it burns?
A) CH4
B) C6H12O6
C) H2

Answer 1

Answer:

C6H12O6

Explanation:

Glucose because Glucose is mainly made by plants and most algae during photosynthesis from water and carbon dioxide, using energy from sunlight.

Answer 2

Answer: The correct answer is Option C.

Explanation:

Combustion reaction is defined as the chemical reaction in which a hydrocarbon reacts with oxygen gas to produce carbon dioxide gas and water molecule. The chemical equation for this reaction follows:

$\text{hydrocarbon}+O_2\rightarrow CO_2+H_2O$

Hydrocarbon are defined as the substances in which hydrogen and carbon atoms are covalently bonded. Elements other than carbon and hydrogen can also be present.

For the given options:

• Option A:  $CH_4$

Methane can undergo combustion reaction and produce carbon dioxide and water because it is a hydrocarbon. The chemical equation follows:

$CH_4+2O_2\rightarrow CO_2+2H_2O$

• Option B:  $C_6H_{12}O_6$

Glucose can undergo combustion reaction and produce carbon dioxide and water because it is a hydrocarbon. The chemical equation follows:

$C_6H_{12}O_6+6O_2\rightarrow 6CO_2+6H_2O$

• Option C:  $H_2$

Hydrogen can undergo combustion reaction and will produce only water as a product. The chemical equation follows:

$2H_2+O_2\rightarrow 2H_2O$

Hence, the correct answer is Option C.