A) \[CaAlS{{i}_{2}}{{O}_{8}}.x{{H}_{2}}O\]
B) \[N{{a}_{2}}A{{l}_{2}}S{{i}_{2}}{{O}_{8}}.x{{H}_{2}}O\]
C) \[CaB{{}_{2}}S{{i}_{2}}{{O}_{8}}.x{{H}_{2}}O\]
D) \[{{K}_{2}}A{{l}_{2}}S{{i}_{2}}{{O}_{8}}.x{{H}_{2}}O\]
Correct Answer: B
Solution :
Zeolites are also known as permutits and in greek it means boiling stone. Zeolites are naturally occurring hydrated sodium alumino silicate minerals (like \[N{{a}_{2}}O.A{{l}_{2}}{{O}_{3}}.xSi{{O}_{2}}.y{{H}_{2}}O,\] where \[x=2\]to 10 and y = 2 to 6) capable of exchanging reversibly its sodium ions for hardness producing ions in water. So, the formula for exhausted permutit is hydrated sodium alumino silicate. \[(N{{a}_{2}}A{{l}_{2}}S{{i}_{2}}{{O}_{8}},x{{H}_{2}}O)\]
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