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Question
Give a reason why – properties of metals are related to their activity or reactivity series of metals. Explain the same with reference to potassium and iron in the series.
Solution
Activity of series of metals is a series of arrangement of metals in order of their reactivity.
Hence, the most active metal is at the top of the series & the least active metal is at the below of the series.
Therefore, the properties of metals are related to their activity or reactivity series of metals.
However, the Potassium (K) is at the top of the series. Hence, it reacts vigorously with cold water. The equation is
\[\ce{2K + 2H2O -> 2KOH + H2}\]
The Iron (Fe) is below the potassium, sodium, calcium and Magnesium. So, It reacts smoothly with water (steam). The equation is
\[\ce{3Fe + 4H2O ⇌ Fe3O4 + 4H2}\]
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