Chapter 14 p block(II) PART 1 The group 15 elements(N.PAs Sb Bi) 1.Within group 15,the trend in values of AH(298 K)is: A.N>P>As>Sb B.N<P<As<Sb C.Bi>Sb>As>P D.N>P<As<Sb 2.When NH3 burns in2,the products are: A.NO and H2O B.NO2 and H2O C.N2O and H2O D.N2 and H2O 3.Which of the following compounds is not potentially explosive? A.HN3 B.N20 C.NH4NO2 D.NH4NO 4.Which shape correctly describes the stated molecule? A.PCl3;trigonal pyramidal B.P2H4;planar C.N2O;bent D.NOz;linear 5.Which trend in bond enthalpy terms is correct? A.N-0>P-O B.N-F<P-F C.NEN<P=P D.N-N>P-P 6.Which statement is incorrect? A.White phosphorus is metastable
Chapter 14 p block (II) PART 1 The group 15 elements (N,P As Sb Bi) 1.Within group 15, the trend in values of ΔaHo (298 K) is: A. N > P > As > Sb B. N < P < As < Sb C. Bi > Sb > As > P D. N > P < As < Sb 2. When NH3 burns in O2, the products are: A. NO and H2O B. NO2 and H2O C. N2O and H2O D. N2 and H2O 3. Which of the following compounds is not potentially explosive? A. HN3 B. N2O C. NH4NO2 D. NH4NO3 4. Which shape correctly describes the stated molecule? A. PCl3; trigonal pyramidal B. P2H4; planar C. N2O; bent D. NO2; linear 5. Which trend in bond enthalpy terms is correct? A. N–O > P–O B. N–F < P–F C. N≡N < P≡P D. N–N > P–P 6. Which statement is incorrect? A. White phosphorus is metastable 1
B.White phosphorus is the standard state of the element C.AH(P black)is negative D.AH(Pred)is positive 7.Which statement is correct? A.N2H is a stronger base than NH3 B.NH2Cl is explosive C.NH2OH is a stronger base than NH D.The most favoured conformer of N2H is a staggered one 8.Which reaction is unlikely to work? A.AsF3+SbFs-[AsF2]*+[SbF6] B.AICls+SbCls-[SbClaT+[AICLT C.SbCls+5HFSbFs+5HCI D.2SbCl3 +Cl2+4CsCl-4Cs*+[SbCl6+[SbCl6] 9.Which statement is incorrect about these oxoacids of phosphorus? A.H3PO3 is a reducing agent B.HaP2O is tetrabasic C.H3PO is made by treating phosphate rock with dilute HaSO D.H3PO2 is monobasic 10.Which of the following reactions of (NPCl2)s would fail to work? A.Reaction of Me2NH to give NMe2 for Cl substitution with the second substitution taking place at the same Patom as the first B.Reaction of water to exchange OH for Cl C.Reaction of NaF to give Ffor Cl substitution with the second substitution taking place at the same P atom as the first D.Reaction with CHsLi to eliminate LiCl 11.In which compound is P in the highest oxidation state? A.[PF6T B.[PPha]" C.PCls D.PaOs
B. White phosphorus is the standard state of the element C. ΔfHo (P, black) is negative D. ΔfHo (P, red) is positive 7. Which statement is correct? A. N2H4 is a stronger base than NH3 B. NH2Cl is explosive C. NH2OH is a stronger base than NH3 D. The most favoured conformer of N2H4 is a staggered one 8. Which reaction is unlikely to work? A. AsF3 + SbF5 → [AsF2] + + [SbF6] – B. AlCl3 + SbCl5 → [SbCl4] + + [AlCl4] – C. SbCl5 + 5HF → SbF5 + 5HCl D. 2SbCl3 + Cl2 + 4CsCl → 4Cs+ + [SbCl6] – + [SbCl6] 3– 9. Which statement is incorrect about these oxoacids of phosphorus? A. H3PO3 is a reducing agent B. H4P2O6 is tetrabasic C. H3PO4 is made by treating phosphate rock with dilute H2SO4 D. H3PO2 is monobasic 10. Which of the following reactions of (NPCl2)3 would fail to work? A. Reaction of Me2NH to give NMe2 for Cl substitution with the second substitution taking place at the same P atom as the first B. Reaction of water to exchange OH for Cl C. Reaction of NaF to give F for Cl substitution with the second substitution taking place at the same P atom as the first D. Reaction with C6H5Li to eliminate LiCl 11. In which compound is P in the highest oxidation state? A. [PF6] – B. [PPh4] + C. PCl3 D. P4O6 2
12.Which statement is incorrect about the solid-state structure of NiAs? A.The As atoms are in a simple cubic arrangement B.The As centres are 6-coordinate C.The Ni centres are 6-coordinate D.Each As centre is in a trigonal prismatic coordination environment 13.Which statement is incorrect? A.In the 19F NMR spectrum of PFs at 298 K,two multiplets are observed B.NBr is explosive,even at relatively low temperatures C.In [F2NO][AsF the [F2NO]ion is planar D.PF3 is protonated by HF/SbFs 14.Which of the following reactions is a redox reaction? A.2NF3+3H2→N2+6HF B.NH+HBr→NHBr C.HNO3+KOH→H2O+KNOg D.N2O3+H20→2HNO2 15.When heated,which metal nitrate would give the respective metal,NO and O? A.AgNO3 B.Cu(NO3)2 C.Pb(NO3)2 D.KNO3 16.All of the following.expect one,are radicals.Which is diamagnetic? A.NOz B.NO C.FNO D.NF2 17.Match up the following acids to the basicities.Which pairing is correct? A.Phosphoric acid;dibasic B.Phosphinic acid;monobasic C.Phosphonic acid;monobasic D.Diphosphoric acid;dibasic
12. Which statement is incorrect about the solid-state structure of NiAs? A. The As atoms are in a simple cubic arrangement B. The As centres are 6-coordinate C. The Ni centres are 6-coordinate D. Each As centre is in a trigonal prismatic coordination environment 13. Which statement is incorrect? A. In the 19F NMR spectrum of PF5 at 298 K, two multiplets are observed B. NBr3 is explosive, even at relatively low temperatures C. In [F2NO][AsF6], the [F2NO]+ ion is planar D. PF3 is protonated by HF/SbF5 14. Which of the following reactions is a redox reaction? A. 2NF3 + 3H2 → N2 + 6HF B. NH3 + HBr → NH4Br C. HNO3 + KOH → H2O + KNO3 D. N2O3 + H2O → 2HNO2 15. When heated, which metal nitrate would give the respective metal, NO2 and O2? A. AgNO3 B. Cu(NO3)2 C. Pb(NO3)2 D.KNO3 16. All of the following, expect one, are radicals. Which is diamagnetic? A. NO2 B. NO C. FNO D. NF2 17. Match up the following acids to the basicities. Which pairing is correct? A. Phosphoric acid; dibasic B. Phosphinic acid; monobasic C. Phosphonic acid; monobasic D. Diphosphoric acid; dibasic 3
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
Correct Answer:AH(P red)is positive 7.Which statement is correct? Correct Answer:NH2Cl is explosive 8.Which reaction is unlikely to work? Correct Answer:AICls+SbCls-[SbCl]*+[AICl] 9.Which statement is incorrect about these oxoacids of phosphorus? Correct Answer:H3PO,is made by treating phosphate rock with dilute H2SO 10.Which of the following reactions of (NPCl2)would fail to work? Correct Answer:Reaction of Me2NH to give NMe2 for Cl substitution with the second substitution taking place at the same Patom as the first 11.In which compound isPin the highest oxidation state? Correct Answer:[PF 12.Which statement is incorrect about the solid-state structure of NiAs? Correct Answer:The As atoms are in a simple cubic arrangement 13.Which statement is incorrect? Correct Answer:In the 19F NMR spectrum of PFs at 298 K,two multiplets are observed 14.Which of the following reactions is a redox reaction? Correct Answer:2NF3+3H2-N2+6HF 15.When heated,which metal nitrate would give the respective metal,NO2 and 022 Correct Answer:AgNO3 16.All of the following,expect one,are radicals.Which is diamagnetic? Correct Answer:FNO 17.Match up the following acids to the basicities.Which pairing is correct? Correct Answer:Phosphinic acid,monobasic 18.What type of a reaction is the conversion of H3PO to HP2O? Correct Answer: 19.Apotential diagram for nitrogen at pHshows the following Evalues NO→HNO2E°=+0.93V 5
Correct Answer: ΔfHo (P, red) is positive 7. Which statement is correct? Correct Answer: NH2Cl is explosive 8. Which reaction is unlikely to work? Correct Answer: AlCl3 + SbCl5 → [SbCl4] + + [AlCl4] – 9. Which statement is incorrect about these oxoacids of phosphorus? Correct Answer: H3PO4 is made by treating phosphate rock with dilute H2SO4 10. Which of the following reactions of (NPCl2)3 would fail to work? Correct Answer: Reaction of Me2NH to give NMe2 for Cl substitution with the second substitution taking place at the same P atom as the first 11. In which compound is P in the highest oxidation state? Correct Answer: [PF6] – 12. Which statement is incorrect about the solid-state structure of NiAs? Correct Answer: The As atoms are in a simple cubic arrangement 13. Which statement is incorrect? Correct Answer: In the 19F NMR spectrum of PF5 at 298 K, two multiplets are observed 14. Which of the following reactions is a redox reaction? Correct Answer: 2NF3 + 3H2 → N2 + 6HF 15. When heated, which metal nitrate would give the respective metal, NO2 and O2? Correct Answer: AgNO3 16. All of the following, expect one, are radicals. Which is diamagnetic? Correct Answer: FNO 17. Match up the following acids to the basicities. Which pairing is correct? Correct Answer: Phosphinic acid; monobasic 18. What type of a reaction is the conversion of H3PO4 to H4P2O7? Correct Answer: 19. A potential diagram for nitrogen at pH 0 shows the following Eo values: [NO3] - → HNO2 Eo = +0.93 V 5