Why do metals form hydroxide when reacted with water and oxide when reacted with steam
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It depends totally on the reactivity of the metals whether they will react with cold water ,hot water ,steam or will not react at all. More reactive metals like sodium and magnesium can react with simply water to form hydroxide because in solutions their hydroxide are stable (they are strongly basic in nature) , while metals with lower reactivity ( relatively lower reactive than sodium and magnesium) like iron react only with steam to first produce hydroxide which is not thermally stable and hence breaks down into iron oxide and water.
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