Chemistry
Table salt gets moist during rainy season because

Sodium chloride is deliquescent
Sodium chloride contains hygroscopic impurities like magnesium chloride
Sodium chloride contains some quantity of sodium iodide
Sodium chloride is hygroscopic

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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
sublimation of sodium to emit yellow colour
The emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum
The low ionisation energy of sodium

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