Chemistry
Burning pyrites ore gives out

Nitric oxide gas
Nitrogen dioxide gas
Sulphur dioxide gas
Carbon dioxide gas

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

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

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