3) I've got a car with an internal volume of 12,000 L. If I drive my car into the river and it implodes, what will be the volume of the gas when the pressure goes from
1.0 atm to 1.4 atm?

The correct answer is oxygen.

Explanation:

Reactivity is defined as the tendency of an atom to loose or gain electrons.

The reactivity of non-metal increases as we move from left to right in a period and decreases as we move from top to bottom in a group.

The given elements are non-metals as they belong to group 15 and group 16  of the periodic table.

For the given options:

Nitrogen (N): It belongs to Group 15 and Period 2 of the periodic table.

Oxygen (O): It belongs to Group 16 and Period 2 of the periodic table.

Selenium (Se): It belongs to Group 16 and Period 4 of the periodic table.

Sulfur (S): It belongs to Group 16 and Period 3 of the periodic table.

From the given elements, the most reactive element will be oxygen.

Order of reactivity of metals follows:

Hence, the correct answer is oxygen.