Chemistry
A substance which readily forms colloidal solution in contact with water is called

Associated colloid
Extrinsic colloid
Hydrophilic colloid
Hydrophobic colloid

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

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

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