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प्रश्न
Which transition metal of 3d series has positive E° (M2+/M) value and why?
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उत्तर
Copper is the transition metal of 3d series that exhibits positive E0(M2+/M). The value of E0(M2+/M) for copper is (+0.34). This happens because the E0(M2+/M) value of a metal depends on the energy changes involved in the following:
1. Sublimation energy: The energy required for converting one mole of an atom from the solid state to the gaseous state.
M(s)→→ M(g) ΔsH (Sublimation energy)
2. Ionisation energy: The energy required to take out electrons from one mole of atom in the isolated gaseous state.
M(g) →→ M2+(g) ΔiH (Ionisation energy)
3. Hydration energy: The energy released when one mole of ions are hydrated.
M2+(g) →→M2+(aq) ΔhydH (Hydration energy)
Since, copper has a high energy of atomisation and low hydration energy, the E0(M2+/M) value for copper is positive.
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संबंधित प्रश्न
Explain giving reason:
Transition metals and many of their compounds show paramagnetic behaviour.
Write down the electronic configuration of Cu+.
Write the different oxidation states of manganese.
Name the elements of 3d transition series that show maximum number of oxidation states. Why does this happen?
Which among the following is not considered as a part of transition elements?
Electronic configuration of Cu3+ is ____________.
Which of the following compounds is expected to be colored?
Explain the observation, at the end of each period, there is a slight increase in the atomic radius of d-block elements.
Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.
Assertion (A) : Copper is a non-transition element.
Reason (R) : Copper has completely filled d-orbitals in its ground state.
