Dear Sir Thank you so much 🥰 bcz i Revise it completely these two chapters just in 37 minutes with the help of these amazing and helpful Lecture . Therefore Thank you so much once again, And Dear Sir kindly I request from you that complete quickly this revision series. Thank you Sir...

Sir... Ap ne jo % of elements ka pataya to yaha par water ka mass 18 hai or ap ne yaha par Oxygen ka 16 lagya hai