Passage-III :
The binary compounds of oxygen with other elements are called oxides. They are classified either depending upon their acid - base characteristics or on the basis of oxygen content.
a ) Normal oxides : These oxides which contain oxygen atoms as permitted by the normal oxidation number, i.e., -2. Normal oxide may be acidic, basic, amphoteric or neutral.
b) Polyoxides : The oxides which contain oxygen atoms different than those permitted by the normal oxidation number of -2.
i) Peroxides : Two oxygen atoms are linked to each other and oxygen has -I oxidation number. They contain `(O-O)^(2)` unit.
ii) Superoxides : These oxides contain `(O-O)^(-1)` units, i.e., each O-atom has oxidation number `-1//2`.
c ) Suboxides : These contain low content of oxygen than expected.
d) Mixed oxides : These oxides are made of two simpler oxides.
Which pair of species is referred to as suboxides?

Options

A. CO, NO
B. `SO_(2), CaO`
C. `N_(2)O, CO`
D. `S_(2)O, C_(3)O_(2)`.

Answer

D