Question

Mars appears red due to the presence of?
(A) carbon oxide
(B) nitrogen oxide
(C) iron oxide
(D) methane

Answer 1

Hint: Mars is the fourth planet in the solar system and from the sun and it is the second smallest planet in the solar system. Mars is the only planet which has the name of the red planet. Some research is done on Mars to find the reason for the red colour.

Complete step by step solution:
The mars can be easily seen from the earth and it can be seen as the reddish colour. The main reason for the red colour is the presence of the maximum amount of the iron oxide content. When the solar system is formed the more amount of the iron oxide content gets stuck with the mars. This is the main reason for the greater amount of the iron oxide content of the mars.

The earth also contains the iron content but in earth, the iron and iron oxide are in the core of the earth, it means the iron oxide content is in under the ground, but in the mars the iron oxide content is present in both the core of the mars and in the upper part of the ground. Generally, the plain iron looks black in colour, when the iron is exposed with the sufficient amount of the oxygen, then the iron will become iron oxide and look reddish in colour.

Hence, the option (C) is the correct answer.

Note: The other options which are given in the question will not lead to the change in the colour of the air or the ground. The main iron oxide content is red hematite. The red hematite is the main reason for the red colour appearance of the mars.