Answer the following:
Sana heats lead nitrate strongly in a test tube until it completely decomposes. Based on the setup, answer the following questions.
1. What colour change is observed in the solid residue after heating lead nitrate?
2. Sana claims that only one gas is produced during the heating of lead nitrate. Do you agree? Give a reason.
3. What are the products formed when lead nitrate is heated strongly?