NDA 2017 Chemistry question
Match List I with List II and select the correct answer using the code given below the Lists : List I (Noble gas) A. Argon B. Neon C. Krypton D. Xenon List II (Use) 1. In lights for advertising display 2. Airport landing lights and in light houses 3. Light in photographer's flash gun 4. In tungsten filament to last longer Code :
Answer: (D)
Solution
Argon is filled in electric bulbs to provide an inert atmosphere so that the tungsten filament lasts longer (A-4). Neon gives the red glow of advertising signs
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