Question

Which one of the following forms, with an excess of CN–
(cyanide), a complex having co-ordination number two?
(a) Cu⁺ (b) Ag⁺ (c) Ni²⁺ (d) Al(OH)₃

Answer 1

Silver will form an excess of cyanide.

correct option is (b).

Explanation:

The total number of points of attachment to the central element is termed the coordination number.

• This can vary from 2 to as many as 16, but is usually 6.
• There is no way to predict the coordination number.
• The arrangement of coordination number 2 is not very common for first row transition metal ion complexes.
• Ag+ + Cl− ---> AgCl (white ppt.)

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