Question

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

A
Ag+
B
Cu2+
C
Cd2+
D
Pb2+

Solution

## The correct option is A Pb$$^{2+}$$Ammonia is a Lewis base. It forms complexes with cations of transition elements. $$Pb^{2+}$$ does not form a complex with ammonia as lead ($$Pb$$) is not a transition element. Lead ($$Pb$$) is a p - block element.Hence option D is correct.Chemistry

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