MHT CET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Identify the use of mixture of \(\mathrm{Ar}\) and \(\mathrm{N}_2\) from following.

A For magnetic resonance imaging
B For production of lasers
C To fill in electric bulbs
D To produce low temperature for research work

Verified Solution

Answer & Solution

Correct Answer

(C) To fill in electric bulbs

Step-by-step Solution

Detailed explanation

The filament in an electric bulb is made using tungsten which would burn quickly when it comes in contact with the oxygen in the air. This is the reason why unreactive gases such as argon and nitrogen are used for filling an electric bulb. These gases are chemically inactive.
Hence, bulbs are filled with chemically inactive Nitrogen or Argon gas in order to prevent the oxidation of tungsten filament used in the bulb.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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