this statement is true.
Example 1 Reaction with air
(i) Sodium even on exposure to air reacts vigorously with
oxygen, i.e., burns to form sodium oxide
(ii) Magnesium, on heating over flame reacts to form magnesium
(iii) Iron, on heating reacts with oxygen to give iron II III
oxide and hydrogen gas, but it does not burn. (3)
Example 2 Reaction with water In the same way, sodium
react violently with cold water, magnesium with boiling water while red hot iron
reacts with steam to produce their corresponding oxides or
hydroxides and hydrogen gas.
This, the order of reactivity is Na>Mg>Fe (2)
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