Iron rod is dipped in concentrated $H N O_{3}$ . After sometime it is dipped into a $A g N O_{3}$ solution. $A g$ was not displaced by iron because:

SRP of silver is less than iron

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Iron and silver have same lattice structure

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Iron becomes passive

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All the above

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Solution

The correct option is C Iron becomes passive
When iron rod is dipped in concentrated nitric acid, oxidation of iron occurs and a thin layer of oxide is formed on the surface. This makes iron passive. Hence when iron rod is dipped into silver nitrate solution, iron cannot displace silver.
Option C is correct.

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Iron rod is dipped in concentrated HNO3. After sometime it is dipped into a AgNO3 solution. Ag was not displaced by iron because:

Iron rod is dipped in concentrated $H N O_{3}$ . After sometime it is dipped into a $A g N O_{3}$ solution. $A g$ was not displaced by iron because: