Which of the following is not a greenhouse gas?a.Nitrogen trifluorideb.Methanec.Hydrogend.Sulfur hexafluoride

To determine which of the listed options is not a greenhouse gas, let's analyze each choice based on their properties and behaviors in the atmosphere.

1. Nitrogen trifluoride (NF₃): This chemical is indeed a potent greenhouse gas, although it is less well-known than carbon dioxide or methane. It has a long atmospheric lifetime and contributes to global warming.

2. Methane (CH₄): Methane is well-known as a significant greenhouse gas, being much more effective at trapping heat in the atmosphere than carbon dioxide over a shorter timescale.

3. Hydrogen (H₂): Hydrogen is not considered a greenhouse gas. While it contributes to indirect greenhouse gas effects in the atmosphere, it does not have the capability to trap heat like the gases mentioned above.

4. Sulfur hexafluoride (SF₆): This gas is also a greenhouse gas, albeit one that is present in much smaller quantities compared to CO₂ and CH₄.

Conclusion

Based on this analysis, the answer to the question "Which of the following is not a greenhouse gas?" is c. Hydrogen.