$Si_2O_7^{6-}$ anion is obtained when

  • A
    no oxygen of a $SiO_4$ tetrahedron is shared with another $SiO_4$ tetrahedron
  • B
    one oxygen of a $SiO_4$ tetrahedron is shared with another $SiO_4$ tetrahedron
  • C
    two oxygen of a $SiO_4$ tetrahedron are shared with another $SiO_4$ tetrahedron
  • D
    three or all four oxygen of a tetrahedron are shared with other $SiO_4$ tetrahedron

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