Advertisements
Advertisements
प्रश्न
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
Advertisements
उत्तर
- Neon – In neon sign advertisements A brilliant red glow is seen on the passage of an electric current through neon gas at low pressure. The colour can be changed by mixing mercury vapour and argon with neon.
- Xenon – In fluorescent bulbs flash bulbs and lasers. It emits intense white light in discharge tubes.
संबंधित प्रश्न
What do you observe when Calcium is heated and then tested with moist blue and red litmus – paper?
Fill in the blank :
________ is the most abundant inert gas present in air.
Name the main components of air.
Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
State a reason why there is a balance in the amount of carbon dioxide in the air, even though carbon dioxide is released into the atmopshere by various processes.
Why does a lump of cotton wool shrink in water?
When air is moving with cool and soothing, it is called a cyclone.
Air also contains a small amount of carbon-di-oxide, water vapour, and some other gases like argon,
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
Mountaineers carry oxygen ______ with them, while climbing high mountains.
Explain the following observations very briefly
An empty glass in fact is not empty.
