Pankaj talwar sr physical chemistry
https://drive.google.com/file/d/1WVbVWn1pkgrefJmR_3KV4SPd-QHQg8kd/view?usp=drivesdk
https://drive.google.com/file/d/1WVbVWn1pkgrefJmR_3KV4SPd-QHQg8kd/view?usp=drivesdk