Chemistry
Peptization is a process of

Dispersing precipitates into colloidal solution
Protection of colloidal solution
Purification of colloids
Precipitation of colloidal particles

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

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

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