Question

8. Air is a homogeneous mixture of gases which also contains argon and nitrogen which are used for filling electric bulbs. But air is not filled in electric bulbs because

• A. the active component of air oxidizes the filament
• B. the boiling point of air is greater than that of argon or nitrogen
• C. air has impurities like dust particles
• D. air exerts more pressure

Answer 1

The correct option is A

the active component of air oxidizes the filament

Explanation:

• Air is a homogeneous mixture of gases like nitrogen $\left({\mathrm{N}}_2\right)$, oxygen $\left({\mathrm{O}}_2\right)$, Carbon dioxide $\left({\mathrm{CO}}_2\right)$, water vapors, dust particles, and trace amounts of inert gases.
• Gases like argon $\left(\mathrm{Ar}\right)$ and nitrogen are used for filling electric bulbs because they are chemically inert gases.
• Air is not filled in electric bulbs because the active component of air i.e. oxygen oxidizes tungsten $\left(\mathrm{W}\right)$ filament and reduces the life of the electric bulbs.

Hence, option (A) is the correct answer.