Question

(i) Name the inert gas which is used for filling weather observation balloons.
(ii) Why is Radon used in cancer treatment ?
(iii) Why is an alloy of tin and lead used in the manufacture of fuse wire?
(iv) Name the gas which is used in advartising sign boards.
(v) Why is argon used in filling electric bulbs?

Answer 1

(i) Helium
(ii) Radon is radioactive element.
(iii) Tin and lead have lower melting points than other merals.
(iv) Neon
(v) Argon is filled in electric bulbs to improve the efficiency of bulb by preventing oxidation of tungsten filament.