Which of the following pair is incorrect?
Gases – Percentage of Volume

Question

Accepted Answer

Option 2 is identified as the correct answer because it contains an incorrect percentage for the volume of carbon dioxide in Earth's atmosphere. The actual percentage of carbon dioxide in the atmosphere is approximately 0.04%, not 0.0036%. This discrepancy makes Option 2 the incorrect pair, as the percentage provided does not accurately reflect the current scientific understanding of atmospheric composition.

Now, let's examine why each of the other options is considered correct:

1. **Nitrogen – 78.08**: Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78.08% of the volume. This percentage is widely accepted and accurately reflects the composition of the atmosphere, making this option correct.

3. **Oxygen – 20.95**: Oxygen is the second most abundant gas in the atmosphere, comprising approximately 20.95% of the volume. This percentage is consistent with scientific data, confirming that this option is correct.

4. **Argon – 0.93**: Argon is a noble gas that makes up about 0.93% of the Earth's atmosphere by volume. This percentage is accurate and aligns with the known atmospheric composition, making this option correct.

In summary, Option 2 is the correct answer because it presents an incorrect percentage for carbon dioxide, while the other options accurately reflect the known percentages of their respective gases in the atmosphere.