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.
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