9th Class Chemistry Notes(Key Book)PTB is a free education and reference app developed by Basit Ali for Android devices. This app is designed to provide students with a comprehensive study guide for 9th class chemistry, eliminating the need for them to carry a physical key book. With this app, students can study anywhere they have internet access.

The app offers long questions, short questions, MCQs, and numericals, making it a complete solution for students who want to prepare for their exams. The user interface is simple and easy to navigate, ensuring that students can easily find the information they need. Overall, this app is a must-have for any 9th class chemistry student who wants to excel in their studies.