Question

choose the correct answer
hydrogen is the lightest of all elements. which of these describes this element at room temperature and under standard pressure conditions?
hydrogen is an odorless, blue - colored, solid.
hydrogen is an odorless, colorless, gas.

Explanation:

Hydrogen at room temperature and standard pressure is known to be a gas. It has no odor and no color. The first option incorrectly states it as a blue - colored solid, which is not true for hydrogen under these conditions.

Answer:

Hydrogen is an odorless, colorless, gas.