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Priyanshu kumar
Read this article dear shib👇
CFSE are responsible for the difference betwenn measured and calculated value of hydration energies(HE)
Subtracting the CFSE value for metal ions from experimentally determined HE values gives calculated CFSE values
Here the increase in experimental values gives the CFSE values
So from there you calculate the value of CFSE..
Option A is correct answer...
Please ask dear shib if any doubt left in this😊🙏