If you have 50 mL of 70%
nitric acid waste then it is advisable to dispose in Concentrated
nitric acid waste.
Because 70% nitric acid is some what
concentrated nitric acid, if it was diluted nitric acid then you
could dispose it in acid compatible aqueous waste. But in given
situation nitric acid is fairly concentrated.
Disposing nitric acid in any base
compatible kit is not good because your waste is an acid.
It is neither inorgic or organic
solid waste so you should not dispose in inorganic / organic solid
waste.
It is not sanitary sewer system is
not made to handle concentrated nitric acid. And hence you should
not dispose nitric acid in sanitary sewer.
The correct answer is option 10.