Question
Chemistry Question on Group 13 Elements
Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a:
A
Tetraanionic complex with coordination number six
B
Neutral complex with coordination number four
C
Dianionic complex with coordination number six
D
Dianionic complex with coordination number four
Answer
Dianionic complex with coordination number four
Explanation
Solution
The reaction of lead chromate with NaOH (in hot, excess conditions) results in the formation of a soluble dianionic complex:
PbCrO4 + NaOH (hot, excess) → [Pb(OH)4]2- + Na2CrO4
The product [Pb(OH)4]2- is a dianionic complex with a coordination number of four.