CBSC Science Chemistry is a mistery , which is full of history, You can study it's mistery if you now its history...... Social links:- To join my Telegram chennel click on the link:- https://t.me/scienceworldlearningbegins Connect with 'Science world' blog click below link :- https://cometolearnscience.blogspot.com/2021/06/importance-of-ph-in-everyday-life.html