Chemistry 2007 JAMB Past Questions - Question 47: The presence of nitrogen in air is to slow down

Correct Answer

A

Explanation

The correct answer is **respiration and combustion**. Here's why:
* **Nitrogen does not slow down respiration.** In fact, oxygen is the gas needed for respiration. Nitrogen makes up a large portion of the air (78%) but is relatively inert and plays no role in the process.
* **Nitrogen does slow down combustion.** The high concentration of nitrogen dilutes oxygen, which is needed for combustion to occur. This is why campfires need more air to keep burning and why specialized atmospheres with higher oxygen content are used for welding and other industrial processes.
* **Nitrogen does not directly affect corrosion.** While some nitrogen compounds can contribute to corrosion in specific situations, the presence of nitrogen in the air itself doesn't significantly impact this process.
* **Nitrogen does not play a role in transpiration.** Transpiration is the process by which plants release water vapor through their leaves. This process is mainly driven by sunlight and temperature, not by the presence of nitrogen.

Therefore, the only option that accurately reflects the impact of nitrogen in air is its ability to slow down both respiration and combustion.