S block elements



  • IMG_20200111_230711__01.jpg Ans is ABC give reason for the answer



  • Down the group size increases which implies that covalent character is dominating(more polarising power i.e charge/radius) by fajan’s rule’s which implies less hydrated radius(radius of element when it is dissolved in water (solvent) which implies less hydration energy which implies the compound is less soluble in water.
    To be soluble, the lattice enthalpy of the salt should be less than hydration enthalpy. In case of LiF, it is the opposite. The lattice enthalpy is very high due to small size of fluoride ions (compared to other Halide ions); the hydration enthalpy is very less. Hence, LiF is insoluble in water.


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