Write any two minerals of Cu.

Write the names and formulae of any tow minerals of Cu. How is the Cu extracted ?

How do the alkali metals occur in nature? Give the names and formulae of any two minerals of an alkali metal.

Write any two limitations of Raoult's law ?

Write any two uses of Helium.

Write any two uses of argon.

Write two important minerals of calcium. Give their composition

Write any two uses of centrifuge.

Write any two properties of compounds with dative bond.

Write any two methods of preparation of nitrobenzene

Define vector product of two vectors and write any two properties of it.