Which metal is available in the highest proportion on the earth's crust?

Malachite is an ore of which metal?

Which gas can be adsorbed on a metal and released when required?

Which method/process is used to prepare sulphuric acid?

When finely powdered ore is placed on a rotating grooved table and rotated rapidly,the lighter impurities are removed. What is this method of concentration called?

Write the electron-dot structure for sodium and chlorine atoms. How do these form a chemical bond? Name the type of bond so formed. Why does a compound so formed have a high melting point?