Which of the following characteristics is common to hydrogen, nitrogen

Which of the following characteristics is common to hydrogen, nitrogen, oxygen and carbon dioxide?

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They are all diatomic.

They are all gases at room temperature.

They are all coloured.

They all have same reactivity.

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CDS-2 – 2018

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Hydrogen, nitrogen, oxygen, and carbon dioxide are all gases at room temperature.

At standard room temperature (around 20-25 °C) and pressure (1 atm), Hydrogen (H₂), Nitrogen (N₂), Oxygen (O₂), and Carbon Dioxide (CO₂) all exist in the gaseous state.

Option A is incorrect because while H₂, N₂, and O₂ are diatomic, CO₂ is triatomic. Option C is incorrect because all four gases are colourless. Option D is incorrect because they have vastly different reactivities (e.g., flammability, ability to support combustion, inertness).

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