Nowadays yellow lamps are frequently used as street lights. Which of the following gases is used in these lamps ?
1). Sodium
2). Neon
3). Hydrogen
4). Nitrogen
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1. Which of the following is usually not an air-pollutant?
3. Which of the following gases will effuse out of football bladder most quickly
4. The gas which turns into liquid at the lowest temperature among the following is
5. The main source of Naphthalene is
6. Helium gas is used in gas balloons instead of hydrogen gas because it is
7. The greenhouse effect is caused by the higher level of which gas in the atmosphere ?
8. Threshold limit value of copper in the atmospheric air is