18.What type of a reaction is the conversion of H3PO to HP2O? A.Neutralization B.Hydrolysis C.Condensation D.Reduction 19.A potential diagram for nitrogen at pHshows the following Evalues NOl-一HNO2E°=+0.93V NO2→NOE°=+0.98V What is the value of E for the reduction of [NO3]-to NO? A.+0.95V B.+1.91V C.+0.64V D.+0.96V 20.To which point group does the SbFs molecule belong? A.C3v B.Dsh C.Cah D.Cav ANSWERS: 1.Within group 15,the trend in values of A H(298 K)is: Correct Answer:N>P>As>Sb 2.When NH3 burns in O2,the products are Correct Answer:N2 and H2O 3.Which of the following compounds is not potentially explosive? Correct Answer:N2O 4.Which shape correctly describes the stated molecule? Correct Answer:PCl3;trigonal pyramidal 5.Which trend in bond enthalpy terms is correct? Correct Answer:N-F<P-F 6.Which statement is incorrect?18. What type of a reaction is the conversion of H3PO4 to H4P2O7? A. Neutralization B. Hydrolysis C. Condensation D. Reduction 19. A potential diagram for nitrogen at pH 0 shows the following Eo values: [NO3]- → HNO2 Eo = +0.93 V HNO2 → NO Eo = +0.98 V What is the value of Eo for the reduction of [NO3]- to NO? A. +0.95 V B. +1.91 V C. +0.64 V D. +0.96 V 20. To which point group does the SbF5 molecule belong? A. C3v B. D3h C. C3h D. C4v ANSWERS: 1. Within group 15, the trend in values of ΔaHo (298 K) is: Correct Answer: N > P > As > Sb 2. When NH3 burns in O2, the products are: Correct Answer: N2 and H2O 3. Which of the following compounds is not potentially explosive? Correct Answer: N2O 4. Which shape correctly describes the stated molecule? Correct Answer: PCl3; trigonal pyramidal 5. Which trend in bond enthalpy terms is correct? Correct Answer: N–F < P–F 6. Which statement is incorrect? 4