Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

Question

Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia? (A)  Ag+  (B)  Cu2+  (C)  Cd2+  (D)  Pb2+

Tardigrade Admin · Accepted Answer

Ammonia is a Lewis base. It forms complexes with transition elements like

A g^{+}, C u^{2 +}

and

C d^{2 +}

while it does not form complex with

P b^{2 +}

because

P b

is not a transition element.

A g Cl + 2 N H_{4} O H \to [A g (N H_{3})_{2}] Cl + 2 H_{2} O

C u S O_{4} + 4 N H_{4} O H \to [C u (N H_{3})_{4}] S O_{4} + 4 H_{2} O

C d S O_{4} + 4 N H_{4} O H \to [C u (N H_{3})_{4}] S O_{4} + 4 H_{2} O

Q. Ammonia is a Lewis base and it forms complexes with many cations. Which one of the following cations does not form a complex with ammonia?

$A g^{+}$

$C u^{2 +}$

$C d^{2 +}$

$P b^{2 +}$