Question

Which of the following is not a use of noble gases?
A.Argon is widely used for filling incandescent electric bulbs
B.Neon is used in safety devices for protecting electrical instruments.
C.Radon is used in radiotherapy of cancer
D.Helium is filled in tubes of cycles and scooters tyres.

Answer 1

Hint: Noble gases belong to the group 18 of the periodic table. Nitrogen is filled in tubes of cycles and scooters tyres as it reduces air loss, boosts fuel economy, reduces rolling resistance, and improves safety.

Complete step by step answer:
Any of the gaseous elements which occupy Group 18 of the periodic table are the noble gases. They have great stability and exhibit very low reaction rates. They are also known as inert gases. They have filled valence shells (octets) which make them extremely non-reactive. They are Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn).
Argon is used extensively in electronics, lighting, glass, and metal fabrications. It is used in electronics to provide a protective heat transfer medium for ultra-pure silicon crystal semiconductors and for growing germanium. It is also used to fill fluorescent and incandescent light bulbs and create the blue light found in neon lamps.
Neon is used in advertising signs. But the most popular use of neon is the neon tubing which is used in advertising and elaborate decorations. These tubes are filled with neon under low pressure and submitted to electrical discharges. It is used in safety devices for the protection of electrical instruments.
Radon is used in radiotherapy, arthritis treatment, and bathing. In radiotherapy, radon is used in implantable seeds, made of glass or gold, primarily used to treat cancers.
Helium is used in balloons and to cool things. It is also used as a component of breathing gases due to its low solubility in fluids or lipids. So, it is not helium but it is nitrogen that is used to fill tubes of cycles and scooters tyres as it reduces air loss and boosts fuel economy.

Therefore, the correct answer is option (D).

Note: Noble gases are colourless, odourless, tasteless and non-flammable gases. Their atomic mass, boiling point, and atomic radii increases down a group in the periodic table. Their first ionization energy decreases down a group in the periodic table. The noble gases have the largest ionization energies which reflect their chemical inertness.