Arrange the following metals according to the order of increasing reactivity. Ca, Zn, Cu, Au
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A.
Au < Cu < Zn < Ca
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B.
Au < Zn < Cu < Ca
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C.
Au < Cu < Ca < Zn
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D.
Au < Ca < Zn < Cu
Correct Answer:
A. Au < Cu < Zn < Ca
Explanation:
The reactivity of metals is determined by their tendency to lose electrons and form positive ions. Among the given options, Gold (Au) is an unreactive noble metal and sits at the bottom of the reactivity series. Copper (Cu) is also relatively low in reactivity. Zinc (Zn) is more reactive than both gold and copper, while Calcium (Ca), being an alkaline earth metal, is highly reactive. Therefore, the correct sequence of these metals in order of increasing reactivity is Au < Cu < Zn < Ca.
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