$(a)\;56\qquad(b)\;136\qquad(c)\;250\qquad(d)\;None\;of\;these$

Answer : 56

Explanation :

Here , $\;SiO_{2}\;$ and $\;H_{2}O\;$ do net carry any charge . The charge present in $\;AlO_{2}\;$ unit is -1 (+3 on Al and -4 on two O - atoms) . Thus negative charge present on 56 $\;AlO_{2}\; $ units is -56 . Therefore , $\;56 Na^{+}\;$ ions are present in one molecule of faujasite

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