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Transition elements should be more react...

Transition elements should be more reactive than hydrogen on the basis of electrode potential. But most of them do not give hydrogen on reaction with dilute acids because

A

an oxide layer is formed on their surface.

B

metallic bonds are strong in them

C

their hydration energy is low.

D

their electronegativity is low.

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To solve the question regarding why transition elements do not react with dilute acids to produce hydrogen, despite having a higher reactivity than hydrogen based on electrode potential, we can follow these steps: ### Step 1: Understand the Reactivity of Transition Elements Transition elements are known for their ability to form various oxidation states and complex ions. They typically have higher electrode potentials compared to hydrogen, which suggests that they should be more reactive. **Hint 1:** Consider the properties of transition metals, such as their oxidation states and complex formation. ### Step 2: Analyze the Reaction with Dilute Acids When transition metals react with dilute acids, they can potentially displace hydrogen from the acid. However, not all transition metals react in this way. **Hint 2:** Think about the conditions under which metals react with acids and the factors that influence this reactivity. ### Step 3: Consider Hydration Energy The key factor that affects the reactivity of transition elements with dilute acids is their hydration energy. Hydration energy refers to the energy released when ions are surrounded by water molecules. Transition metals generally have lower hydration energies compared to alkali and alkaline earth metals. **Hint 3:** Recall how hydration energy influences the stability of ions in solution and their tendency to react. ### Step 4: Conclusion Due to the low hydration energy of transition metals, they do not readily release hydrogen gas when reacting with dilute acids. This is because the energy required to displace hydrogen from the acid is not compensated by the energy released during hydration. **Hint 4:** Summarize the relationship between hydration energy and the reactivity of metals with acids. ### Final Answer Most transition elements do not produce hydrogen when reacting with dilute acids because their low hydration energy does not favor the displacement of hydrogen ions from the acid.
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