Answer is (d) BiH3 < SbH3 < AsH3 < PH3 < NH3 [ increasing bond angle]
(a) I2 < Br2 > F2 > CI2. [ increasing bond dissociation enthalpy]: incorrect order , correct order is Cl2 > Br2 > F2 > I2.
(b) H2O > H2S < H2Te < H2Se [ increasing acidic strength]: incorrect order , correct order is
H2O < H2S < H2Se < H2Te
(c) NH3 < N2O < NH2OH < N2O5 [ increasing oxidation state ] : incorrect order NH3
(Oxidation state -3) N2O (Oxidation state +1) NH2OH(Oxidation state -1) N2O5 (Oxidation state +5)