A group of students looked at different metals and metal sulphate solutions given in a tabular form. From the data answer the following :
(i) Which metal reacted with all other metal sulphate solutions ?
(ii) Which metal did not react with any other metal sulphate solution ?
(iii) Put the metals in decreasing order of reactivity.
(iv) Iron is slightly more reactive than cobalt. With which other metal sulphate solution, will it react ?
`{:("Metal","Metal sulphate solution","Colour"),("Chromium","Chromium sulphate","green"),("Cobalt","Cobalt sulphate","pink"),("Copper","Copper sulphate","blue"),("Magnesium","Magnesium sulphate","Colourless"):}`