alleryStart learning →In the reactivity (activity) series, which of these metals is the MOST reactive?
Airon
Bzinc
Cpotassium
Dcopper
Answer & Solution
Correct answer: C. potassium
1. The activity series lists metals in decreasing order of reactivity: K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au.
2. Of the options, **potassium** sits at the very top, so it is the most reactive.
3. Copper is well below hydrogen and is the least reactive here.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch3 'Metals and Non-metals', §3.2.5_
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