Chemistry
The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is

3.05 gram
5.05 gram
4.05 gram
2.05 gram

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

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

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