question_answer

   'M' is an element which is out of Cu, Fe, Al, Na. It shows the following properties: (i) One of its ore is rich in M2O3. (ii) M2O3 is not affected by water. (iii) It corrodes easily. (iv) It forms two chlorides MCl2 and MCl3. Identify 'M'.

Answer:

                  As the metal 'M' forms oxide M2O3 it is trivalent. Out of the metals listed, only Fe and Al are trivalent. M2O3 is not affected by water, so 'M' can be out of Fe or Al. Fe and Al both corrode easily. Out of Al and Fe, only Fe can form divalent chloride, so the element 'M' is Fe.