B (a) – (iii), (b) – (iv), (c)-(i), (d) – (ii) C (a)-(iv), (b) – (iii), (c) – (ii), (d) – (i) D (a) – (i), (b) – (ii), (c) – (iii), (d) – (iv)
Solution:
Metal oxides are generally basic in nature, whereas nonmetal oxides are acidic.
Oxides that are neither acidic nor basic are known as neutral oxides. CO is a non-reactive gas.
Salt and water are formed when amphoteric oxides react with acids and alkalis.
Aluminium oxide is a type of amphoteric oxide.
Option A is the correct answer.
![\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{-2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-c5a91864ba7e1e0ed1b5d273d822f5e5_l3.png "Rendered by QuickLaTeX.com")
(b) ![\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-ffda616d3dbe7dc8925722e87005924e_l3.png "Rendered by QuickLaTeX.com")
(c) ![\left[\mathrm{PdCl}_{4}\right]^{2-}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-90cc6a4f4d42dee46e06d6f8ed516b7a_l3.png "Rendered by QuickLaTeX.com")
(d) ![\left[\mathrm{NiCl}_{4}\right]^{2}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-149ee5c95bd9cfcc4405704fba2e1bab_l3.png "Rendered by QuickLaTeX.com")
(d) all of these