Praxis II General Science

Category - Chemistry

Which of the following species has a covalent bond type?
  1. FeO
  2. CH4
  3. NaCl
  4. HCl
  5. H3PO4
Explanation
Answer: B - A covalent bond type will have species that have an oxidation state of zero, as seen in answer B. Answers D and E are acids, and the proton (H+) is ionically bound to the conjugate base. In answer A, the iron is oxidized Fe2+ and is bound to O2-, again an ionic bond.
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