phosphorus pentoxide , P4O10 has each phosphorus linked to

  1. 5 oxygen atoms with P-P bonds.
  2. 5 oxygen atoms
  3. 4 oxygen atoms
  4. 4 oxygen atoms with P-P bonds

Each Phosphorous in P4O10 is attached with 4 oxygen atom and does not have any P-P linkage. 
For structure you may refer to the following link:

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