Answer the question on basis of passage given below:

The noble gases have closed shell electronic configuration and are monatomic gases under normal conditions. The low boiling points of lighter noble gases are due to the weak dispersion forces between the atoms and the absence of other inter atomic interaction. The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers +2, +4 and +6.

\(XeF_4\) reacts violently with water to give \(XeO_3\). The compound of Xenon exhibit stereoisomerism and their geometries can be deduced considering the total number of electrons in the valence shell.

Which noble gas is generally used in illuminating warning signals?

Neon

The correct answer is option 2. Neon.

Neon gas emits a distinct bright red-orange light when an electrical current passes through it. This phenomenon is due to the excitation of neon atoms, which occurs when electrons in the neon atoms are energized by the electric current. As these energized electrons return to their original energy level, they release the excess energy in the form of light.

The emitted light from neon is particularly vibrant and easily visible, even in daylight conditions. Because of this characteristic color and brightness, neon gas is commonly used in illuminating signs, displays, and warning signals to attract attention and convey messages effectively.

For warning signals, such as emergency exits, hazard signs, or traffic signals, neon is preferred due to its high visibility, ensuring that the warnings are easily noticed, even from a distance or in adverse weather conditions. Therefore, neon gas is the noble gas of choice for illuminating warning signals.