Chemistry
Magnalium is an alloy of

Manganese and Magnesium
Magnesium and Tin
Aluminium and Magnesium
Aluminium and Zinc

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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
sublimation of sodium to emit yellow colour
The low ionisation energy of sodium
Its ability to absorb all other colours except yellow

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