Give reasons : Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Which of the following methods is suitable for preventing an iron frying pan from rusting ?
Write equations for the reactions of
$(i)$ iron with steam
$(ii)$ calcium and potassium with water
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
What chemical process is used for obtaining a metal from its oxide ?
Which of the following pairs will give displacement reactions ?