6. What's the structure of PF? Is it polar or non-polar? O A. Square pyramid, non-polar
OB. Trigonal bipyramidal, non-polar
O C. Square pyramid, polar
O D. Trigonal bipyramidal, polar

Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).

The answer is d) light rays pass through mirrors at an angle.