Write one property of hydrogen which resembles alkali metal atoms and one property which resembles halogen atoms.

Why the properties of Li resemble with resembles with Mg?

Write two properties of water which are due to hydrogen bonding.

What makes alkali metal halides sometimes coloured, which are otherwise Colourless?

Mention two properties which are similar for berylium and aluminium.

Name one metal which is refined by Van Arkel method?

Write down one preparation method of hydrogen peroxide. What happens when hydrogen peroxide react with(ii) aqueous Kl solution? Write necessary reactions.

What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?