Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > O2- > F- > Na+
Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-
N3- > Na+ > O2- > F-

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Chemistry
Sullage water is –

Waste water released from kitchen
Waste water released from toilets
Waste water released from factories
Waste water released from hospitals

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