Fill in the blanks
1- Energy required for completion of physical changes is ------ ( released / absorbed) when the change is reversed.
2- Dissolution of lead nitrate in water is deemed as a ------- ( physical / chemical ) change .

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Solution

Dear student,
1. When a physical changes is reversed energy is released. So released is the answer.
2. Dissolution of Lead nitrate in water is physical change.
Therefore physical is the answer.
Regards.

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