When freshly cut, the alkali metals appear lustrous but their swfaces get tarnished when exposed to air. Explain your answer with reasons.

Group-2 metals get tarnished on exposure to air-Explain.

A freshly cut piece of sodium metal appear shiny but its metallic iustre soon gets tarnished when exposed to air. Give reason.

Which Gr-2 metal burns readily when exposed to air?

The alkali metals exhibit +I oxidation state-Explain your answer with reason.

A metal gets coated with a green basic carbonate when exposed to moist air. The metal is -

Name the alkali metals which forms superoxide when heated in excess of air and why?

Alkali metals become opaque when they are kept open in air Why?

Explain the following observation: Lumps of quicklime is converted into powder when exposed to air for some time.

When a liquid vaporises in a closed container, an equilibrium establishes between the liquid and its vapour. Will this equilibrlium be established if the liquid is vaporised in an open container? Given reason for your answer.

When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.