please answer it............
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Answer:
Due to reactivity of the metals.
Explanation:
The reactivity series(decreasing reactivity):
K
Na
Ca
Mg
Al
Zn
Fe
Sn
Pb
[H]
Cu
Hg
Ag
Au
Pt
Mg is placed above Cu in the series. So, Mg is more reactive than Cu. Hence, it displaces Cu and there is a reaction.
Whereas, Zn is below Ca. So it cannot displace Ca as Ca is more reactive. hence, no reaction.
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