JEE Main202427 Jan 2024Morning ShiftChemistryCoordination CompoundsActual
Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :
Options
- ATetraanionic complex with coordination number six
- BNeutral complex with coordination number four
- CDianionic complex with coordination number six
- DDianionic complex with coordination number four
Correct answer
D. Dianionic complex with coordination number four
Step-by-step solution
Lead chromate is yellow in color due to their absorption and reflection of specific wavelengths of light. PbCrO 4 + NaOH ( hot excess ) → [ Pb ( OH ) 4 ] - 2 + Na 2 CrO 4 The complex formed is Pb OH 4 2 - which has coordination number = 4 and complex is dianionic due to presence of - 2 charge. coordination number, the number of atoms, ions, or molecules that a central atom or ion holds as its nearest neighbours in a complex or coordination compound or in a crystal.