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