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Which sequence correctly shows decreasing reactivity of these metals with dilute acids?
AAl > Mg > Fe > Zn
BFe > Zn > Al > Mg
CMg > Al > Zn > Fe
DZn > Fe > Mg > Al
Answer & Solution
Correct answer: C. Mg > Al > Zn > Fe
1. When these metals react with dilute acids, hydrogen gas is liberated.
2. The order of decreasing reactivity given is Mg > Al > Zn > Fe.
3. Magnesium is most reactive and iron least among these four.
4. The reversed order Fe > Zn > Al > Mg places iron first, which is incorrect.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.104_
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