Which of the following is true about dinitrogen oxide?

It is a colourless gas

The correct answer is: 4. It is a colourless gas

Dinitrogen oxide, also known as nitrous oxide or laughing gas, is a colorless gas with a slightly sweet odor. It is not yellow, the oxidation state of nitrogen is +1, and it is not basic in nature. Nitrous oxide is a commonly used anesthetic and analgesic. It is also used as a food additive and as a propellant in whipped cream dispensers.

Here are some of the properties of dinitrogen oxide:

• Molecular formula: \(N_2O\)
• Molar mass: 44.01 g/mol
• Melting point: -89.5°C
• Boiling point: -88.4°C
• Density: 1.26 g/L at 0°C
• Solubility in water: 51.5 g/L at 0°C