NTA Abhyas JEE Main2020Chemistrys Block ElementsPractice
The solubility order for alkali metal fluoride in water is
Options
- AL i F < R b F < K F < N a F
- BR b F < K F < N a F < L i F
- CL i F > N a F > K F > R b F
- DL i F < N a F < K F < R b F
Correct answer
D. L i F < N a F < K F < R b F
Step-by-step solution
Higher the lattice enthalpy lower will be solubility i.e., lattice enthalpy ∝ 1 Solubility Since the lattice enthalpy of alkali metals follow the order L i > N a > K > R b Hence the correct order of solubility is L i F < N a F < K F < R b F