nSiX4 + (4–n) SiY4 ⇌ 4SiXnY4–n [n = 0,1,2,3,4]
If X and Y can be H and F respectively then find number of species with formula SiXnY4–n , which can act as Lewis acid.
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[n = 0,1,2,3,4]
SiXnY4–n can be : SiH4, SiH3F, SiH2F2, SiHF3, SiF4, and all of them can act as Lewis acid.