Q. Which among the following statements are correct? (i)Carbon monoxide is neutral whereas SO_{3} is acidic. (ii)Potassium oxide is basic whereas nitrous oxide is acidic. (iii) Aluminium and zinc oxides are amphoteric. (iv) Sulphur trioxide is acidic whereas phosphorus pentoxide is basic. (v) Carbon dioxide is neutal whereas sulphur dioxide is amphoteric
A) (ii) and (iii)
B) (i) and (iv)
C) (i) and (iii)
D) (ii) and (iv)
Explanation
(c)
(i) carbon monoxide is neutral and SO_{3} is acidic.
(ii)aluminium and zinc oxides are amphoteric , so aluminium and zinc oxides react with both as acid and base.
Al_{2} O_{3} + 6HCl ⟶2AlCl_{3} +3H_{2}O(with acid)
Al_{2}O_{3}+2NaOH +3H_{2}O⟶2NaAl(OH)_{4}(with base)
ZnO +H^{+}⟶Zn^{2+}+H_{2}O(in acid)
ZnO+$2OH^{-}\$ +H_{2}O⟶[Zn(OH)_{4}]^{2-}(in base)
Hence, (i) and (iii) are correct.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.