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Q108
(NDA-I/2023)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity ?
Explanation
The reactivity series (or activity series) of metals is an arrangement of metals in the decreasing order of their chemical reactivity. Metals that lose electrons easily to form positive ions are placed at the top, while less reactive metals are at the bottom.
- Sodium (Na): As an alkali metal, it is highly reactive and reacts vigorously with water and air.
- Iron (Fe): It is a transition metal that reacts with steam and oxygen (rusting) but is significantly less reactive than alkali metals like sodium.
- Copper (Cu): It is a low-reactivity metal that does not react with water or dilute acids.
- Silver (Ag): Classified as a noble metal, it is highly unreactive and resistant to corrosion, placing it near the bottom of the series.
Therefore, the correct decreasing order of reactivity is Sodium > Iron > Copper > Silver, which corresponds to Option D.
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