Multiple choice general knowledge science & technology Which of the following gases is green in color? neon hydrogen chlorine krypton Reveal answer Fill a bubble to check yourself C Correct answer Explanation Chlorine gas (Cl2) has a distinctive greenish-yellow color, which makes it easily identifiable. This is why it was named after the Greek word 'chloros' meaning greenish-yellow. Neon, hydrogen, and krypton are colorless gases.