In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is
1) A2B5
2) A3B2
3) A2B3
4) A3B4
ZA = 88 ; ZB = 52
So formula of compound is AB52
i.e., A2B5.
The percentage of nitrogen in the air is about
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