Chemistry
The chemical name of 'Plaster of Paris' commonly used for setting broken bones is

Calcium nitrate
Calcium carbonate
Calcium sulphate
Calcium chloride

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

The low ionisation energy of sodium
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

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