What are metachromatic granules?

you are given the following materials 1. Marble chips 2. Dilute hydrochloric acid 3. Zinc granules Identify the type of reaction when marble chips and zinc granules are added separately to acid and zinc granules are added separately to acid taken in two tubes . write chemical equations in each case .

What are systematic errors? (or) What are the Classifications of Systematic errors?

What is a chemical equilibrium ? What are its characteristics ?

What are chordae tendinae and what is their function?

What is Calculus ? What are the types of Calculus ?