Question

Methane is a colorless, odorless gas. it oxidizes in air and has a boiling point of -161°

Answer 1

Answer : The chemical property of methane is, Oxidizes in air.

Explanation :

Physical property : It can be observed or measured when no changes occurs in the chemical composition of the substance.

For example : color, boiling point, melting point, odor, density, etc.

Chemical property : It can be observed or measured when changes occurs by the chemical reaction in the composition of the substance.

For example : oxidation, combustion, toxicity, rusting, etc.

From the given options, methane oxidizes in the air shows the chemical property. While the other options, colorless, odorless and boiling point shows the physical property.

When methane react with oxygen to produce carbon dioxide and water.

$CH_4(g)+O_2(g)\rightarrow CO_2(g)+H_2O(l)$

Therefore, the correct answer is, Oxidize in air.

Answer 2

Answer: oxidizes in air

Explanation: Chemical property is the property which deals with change in chemical composition of the substance.

Physical change is the property which deals with change in physical state of the substance.

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

The above equation represents the oxidation of methane to form carbon dioxide and water. Thus the chemical composition has changed and is a chemical property.

Color and odor only involves no change in chemical composition.