Which of the following gases is essential for all aerobic forms of life?

Question

Question

This question was previously asked in

RRB Group D 8 Sept 2022 Shift 3 Official Paper

Answer 1

The correct answer is O2.

Key Points

O2 gas is essential for all aerobic forms of life.
Oxygen is the name of the chemical element that has the atomic number 8 and the letter O.
It is a very reactive nonmetal that is a member of the chalcogen group of the periodic table and an oxidising agent that readily forms oxides with most elements as well as other compounds.
After hydrogen and helium, oxygen is the third most plentiful element in the universe and the most abundant element on Earth.

Additional Information

Two oxygen molecules combine to form molecule O₂.
Our bodies have evolved to breathe oxygen, which makes up the majority of our atmosphere.
Chemical elements are substances that only contain one kind of atom, such as oxygen.
Since oxygen has an atomic number of 8 and the official chemical symbol O, an oxygen atom has eight protons in its nucleus.