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

Calcium chloride
Calcium sulphate
Calcium nitrate
Calcium carbonate

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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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