Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a:

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Strategy:
 Trace the reaction between lead chromate (yellow) and hot sodium hydroxide to find the specific complex formed.

Step 1: Write the chemical equation
Lead chromate reacts with excess NaOH to form a soluble plumbite complex:

Step 2: Analyze the product
The complex formed is the tetrahydroxidoplumbate(II) ion, .
- Charge = -2 (Dianionic).
- Coordination number = 4 (four  ligands).

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