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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
Write down the electronic configuration of Cr3+.
Write down the electronic configuration of Co2+.
Write down the electronic configuration of Lu2+.
Write the different oxidation states of manganese.
Which among the following is not considered as a part of transition elements?
Which of the following compounds is expected to be colored?
Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.
Give reason for the following statements:
Scandium (Z = 21) is a transition element but Zn (Z = 30) is not.
Define transition metals.
Match the properties with the elements of 3d series:
| (i) | lowest enthalpy of atomisation | (p) | Sc |
| (ii) | shows maximum number of oxidation states | (q) | Mn |
| (iii) | transition metal that does not form coloured compounds |
(r) | Zn |
| (s) | Ti |
