23. Stability of trihalides of nitrogen= NF3 > NCl3 > NBr3 24.Lewis base strength= NF3 PCI3 > AsCl3 > SbCl3 > BiCl3 26.Lewis acid strength of trihalides of P, As, and Sb= PCl3 > ASCl3 > SbCl3 27. Lewis acid strength among phosphorus trihalides PF3 > PCl3 > PBr3 > PI3 (28) Melting and boiling point of hydrides= H2O > H2Te > H2Se >H2S 29. Volatility of hydrides= H2O < H2Te < H2Se < H2S 30. Reducing nature of hydrides= H2S < H2Se < H2Te 31. Covalent character of hydrides= H2O < H2S < H2Se < H2Te 32. The acidic character of oxides (elements in the same oxidation state)= SO2 > SeO2 > TeO2 > PoO2 SO3 > SeO3 > TeO3 33. Acidic character of oxide of a particular element (e.g. S)= SO < SO2 < SO3 SO2 > TeO2 > SeO2 > PoO2 34. Bond energy of halogens= Cl2 > Br2 > F2 > I2 35. Solubility of halogen in water = F2 > Cl2 > Br2 > I2 36. Oxidising power= F2 > Cl2 > Br2 > I2 37. Enthalpy of hydration of X ion= F- > Cl- > Br- >I- 38. Reactivity of halogens:= F> Cl> Br > I 39. Ionic character of M-X bond in halides = M-F > M-Cl > MBr > M-I 40. Reducing character of X ion:= I- > Br- > Cl- > F- 41. Acidic strength of halogen acids= HI > HBr > HCI > HF 42 Reducing property of hydrogen halides = HF < HCL < HBr < HI 43. Oxidising power of oxides of chlorine = Cl2O > ClO2 > Cl206 > Cl2O7 44. Decreasing ionic size= 02- > F- > Na+ > Mg2+ 45 Increasing acidic property= Na2O3 < MgO < ZnO< P205 46 Increasing bond length= N2
