7th std//Science//Live Experiment with Natural Indicators //Ch2. Acids and Bases//Lecture 4.
Channel: Web School Academy
Date: 23/07/2020

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Lecture 1
https://youtu.be/jpFV_gx5PFU
Lecture 2 
https://youtu.be/sftzlQTyOmc
Lecture 3
https://youtu.be/4UVukmshykc