Chapter 5 (Acids, Bases and Salts) of Class 7 Science NCERT Book (PDF) is available here for download in PDF format. Download and prepare for CBSE Class 7 Science exam.

How does it work? Acids, bases, and neutral substances can all be compared on a spectrum called the pH scale. “Neutral” is where most of our body fluids are: neither acid nor base, but in the middle ...

The composition of sweat makes it a valuable diagnostic fluid. While it is mostly water, the small fraction containing ...