Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Give reasons : Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
Explain the meanings of malleable and ductile
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_2SO_4$.