Diversity In Living Organisms — Science STD 9 — Question

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

Give the formulae of the compounds formed from the following set of element:
Boron and oxygen.

Name a non-metal which is a good conductor of electricity.

Calculate the molar mass of the following substances:
Phosphorus molecule, P₄ (atomic mass of phosphorus = 31).

What is that technique of farming which does not disturb the balance of nature?

Name the process you would use to separate oil from water.

An object has mass of 20kg on earth. What will be its (i) mass, and (ii) weight, on the moon? (g on moon = 1.6m/s²).