Arrange the following metals in decreasing order of reactivity as verified in NCERT reactivity series
A{'text': 'Fe > Zn > Al > Mg > Ca > Na > K', 'label': 'A'}
B{'text': 'K > Na > Ca > Mg > Al > Zn > Fe', 'label': 'B'}
C{'text': 'K > Ca > Na > Fe > Mg > Al > Zn', 'label': 'C'}
D{'text': 'Al > Zn > Fe > K > Na > Mg > Ca', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'K > Na > Ca > Mg > Al > Zn > Fe', 'label': 'B'}
1. NCERT gives the reactivity series in decreasing order.
2. Top of series (most reactive): K > Na > Ca > Mg > Al.
3. Middle: Zn > Fe > Pb > (H).
4. Least reactive: Cu > Hg > Ag > Au. So the correct order is K > Na > Ca > Mg > Al > Zn > Fe.
_Source: NCERT Class 10 Science, Ch 3 "Metals and Non-metals", §3.2.5 Table 3.2_
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