Chemistry
Sodium vapour lamps glow with yellow colour. This is due to

The low ionisation energy of sodium
Its ability to absorb all other colours except yellow
sublimation of sodium to emit yellow colour
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

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Chemistry
Which of the process is known as nitrification?

Conversion of ammonia to nitrites
Reaction of nitrogen dioxide with water to form nitric acid
Reaction of Nitrogen Monoxide with oxygen to form nitric acid
Conversion of nitrite to nitric oxide

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