Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Give an example of a metal which

$(i)$ is a liquid at room temperature.

$(ii)$ can be easily cut with a knife.

$(iii)$ is the best conductor of heat.

$(iv)$ is a poor conduct of heat.

Which of the following methods is suitable for preventing an iron frying pan from rusting ?

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Write equations for the reactions of

$(i)$ iron with steam

$(ii)$ calcium and potassium with water

$(i)$ Write the electron-dot structures for sodium. oxygen and magnesium.

$(ii)$ Show the formation of $Na _{2} O$ and $MgO$ by the transfer of electrons.

$(iii)$ What are the ions present in these compounds ?