Q. The formula of exhausted permutait is:

 1972  205 EAMCETEAMCET 2004 Report Error

Solution:

Zeolites are also known as permutits and in greek it means boiling stone. Zeolites are naturally occurring hydrated sodium alumino silicate minerals (like where 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.