Chemistry
Silver halides are used in photographic plates because they are

Oxidised in air
Totally colourless
Reduced by light
Soluble in hyposolution

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

sublimation of sodium to emit yellow colour
The low ionisation energy of sodium
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

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Chemistry
Table salt gets moist during rainy season because

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

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