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Reaction 1 is decomposition and decomposition reactions are always endothermic. That heating upto 1000 degrees Celcius was an absolute hint too.
What is the definition of Standard Cell Potential according to Cambridge syllabus?
Our sir made us write that SF6 has the octahedral shape. I should you should check what your sir made you write. In addition to that, you should follow the marking scheme.
It's the same thing, but the term octahedral is preferred.
The equation for the enthalpy of solution is. E= hydration energy - lattice energy so if the value of hydration energy is greater than the lattice energy then the enthalpy of solution will be positive. As a general rule, the more positive the enthalpy of solution is, the higher is the solubility. The hydration energy depends on the cations, so the difference in their size is relevant to the change in energy, while for lattice energy, neutral molecules are formed and since the sizes of the cations are negligible compared to the sulfate ion, the size of the molecule remains roughly the same as we decend the group so the lattice energy doesn't change that much, but as the the size of the cation increases down the group l, the hydration energy decreases significantly. Since the decrease in hydration energy is greater than the decrease in LE, the enthalpy of soliton is less positive and the solubility deceases
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