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a
CaAl2Si2O8.xH2O
b
Na2Al2Si2O8.xH2O
c
CaB2Si2O8.xH2O
d
K2Al2Si2O8.xH2O
answer is A.
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Detailed Solution
Na2Al2Si2O8.xH2O+Ca+2→ CaAl2Si2O8.xH2O+2Na+Permutit contains IA group ions and these ions get exchange with calcium or Magnesium ions when hard water pass through it.