Explain why
Water with detergent disolved in it should have small angles of contact.

The clean water should have BOD value

Explain why we should conserve biodiversity?

Explain why pure water has the maximum water potential.

Explain why Factory waste is neutralised before disposing it into the water bodies.

Explain why a tank filled with water or swimming pool looks shallower. Explain with the help of a ray diagram.

Explain why calcium metal after reacting with water starts floating on its surface. Write the chemical equation for the reaction.