Which of the following order is correct :AlF3 < AlCl3 < AlBr3 ; Lattice energyLi+ < Na+ < K+ ; Hydration energyS > O > N ; Electron affinityCl2 < F2 ; Bond dissociation energy

To determine the correct order for each of the given comparisons, we will analyze each statement step by step:

1. Lattice energy: Lattice energy is the energy released when ions come together to form a solid lattice structure. It is inversely proportional to the size of the ions and directly proportional to the charges of the ions. In this case, we are comparing the lattice energies of Li+, Na+, and K+ ions. Since Li+ has the smallest size and highest charge, it will have the highest lattice energy. Therefore, the correct order is Li+ > Na+ > K+.

2. Hydration energy: Hydration energy is the energy released when ions are surrounded by water molecules in an aqueous solution. It is influenced by the size and charge of the ions. In this case, we are comparing the hydration energies of S, O, and N ions. Since S has the largest size and highest charge, it will have the highest hydration energy. Therefore, the correct order is S > O > N.

3. Electron affinity: Electron affinity is the energy change that occurs when an atom gains an electron. In this case, we are comparing the electron affinities of Cl2 and F2. Fluorine (F) has a higher electron affinity than chlorine (Cl) because it has a smaller atomic size and a higher effective nuclear charge. Therefore, the correct order is Cl2 < F2.

4. Bond dissociation energy: Bond dissociation energy is the energy required to break a bond between two atoms. The given statement does not provide any specific comparison or order for bond dissociation energy.

In summary, the correct orders are:

• Lattice energy: Li+ > Na+ > K+
• Hydration energy: S > O > N
• Electron affinity: Cl2 < F2
• Bond dissociation energy: No specific order provided.