Question

Identify the statements which are not correct?
(i) $ZnO ,\, PbO ,\, Sb _{2} O _{3}$ are neutral oxides.
(ii) $CO$ and $NO$ are amphoteric oxides.
(iii) $CrO _{3},\, Mn _{2} O _{7},\, V _{2} O _{5}$ are basic oxides.

• A. i, ii
• B. i, iii
• C. ii, iii
• D. i, iii, iii

Answer 1

Answer: (D)

(i) $ZnO,\, PbO,\, Sb _{2} O _{3}$ are amphoteric oxides that have the properties of both acids and bases. They have acidic properties against bases and basic properties against acids.

(ii) CO and NO are neutral oxides since they are oxygen poor compounds of non-metals.

iii) $CrO _{3},\, Mn _{2} O _{7},\, V _{2} O _{5}$ are acidic in nature.