Which one of the following is the correct order of relative reactiviti

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Which one of the following is the correct order of relative reactivities of metals Ca, Al, Hg and Au?

”Ca
”Au
”Al
”Ca
This question was previously asked in
UPSC Geoscientist – 2021
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The reactivity of metals is typically determined by their tendency to lose electrons and form positive ions. This is represented by the reactivity series. The standard reactivity series is: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au > Pt.
Comparing the given metals:
Calcium (Ca) is above Aluminium (Al) in the series.
Aluminium (Al) is above Mercury (Hg) and Gold (Au).
Mercury (Hg) is above Gold (Au).
Therefore, the correct order of decreasing reactivity is Ca > Al > Hg > Au.
The reactivity series orders metals from most reactive (top) to least reactive (bottom) based on their tendency to lose electrons. Ca is higher than Al, which is higher than Hg, which is higher than Au.
More reactive metals can displace less reactive metals from their compounds. Gold and Platinum are known as noble metals because they are very unreactive.

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