A) Zeolites
B) Ultramarines
C) Feldspars
D) Beryls
Correct Answer: C
Solution :
[c] The feldspars are most abundant aluminosilicate minerals in the Earth surface. The silicon atoms and aluminium atoms occupy the centres of interlinked tetrahedral of \[SiO{{_{4}^{4-}}^{~}}\] and\[AlO_{4}^{5-}\]. These tetrahedral connect at each corner to other tetrahedral forming an intricate, three dimesional, negatively charged framework. The sodium cations sit within the voids in this structure.
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