JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Which one of the following forms a complex with an excess of (cyanide)?

(A)Correct
(B)Elemental silver metal (does not form an anionic cyanide complex on its own)
(C)An inert noble-gas-configuration cation that does not complex with cyanide
(D)A main-group cation with no empty low-energy orbitals available for complexation

Answer: (A)

Solution

readily forms the linear complex with excess cyanide ion,

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Question ID VK-155446