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in Classification of elements and periodicity in properties by (15 points)
7. The reactivity of metal with water is in the order of (a) \( Na > Mg > Zn > Fe > Cu \) (b) \( Cu > Fe > Zn > Mg > Na \) (c) \( Mg > Zn > Na > Fe > Cu \) (d) \( Zn > Na > Mg > Fe > Cu \)

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by (15 points)
(a)Na>Mg>Zn>Fe>Cu

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