Section-D: Comprehension Type
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
• Peroxides: Two oxygen atoms are linked to each other and each oxygen has −1 oxidation number. They contain (O – O)2−unit
• Superoxides: These oxides contain (O – O)−1unit, 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 of the following pairs contains neutral oxides?