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a
2
b
4
c
6
d
8
answer is C.
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Detailed Solution
SiO2+6HF→H2SiF6 Fluorosilicicacid +2H2OH2SiF6 → [SiF6]-2 + 2H+ The number of bonds around the Si atom is "6"Covalency of "Si" is 6 in hydrofluoro silicic acid