In which of the following arrangement, the order is/are according to the property indicated against it ?

In which of the following arrangement, the order is/are according to t

1.	In which of the following arrangement, the order is/are according to the property indicated against it ?
Answer» Decreasing boiling point : `SbH_3 gt NH_3 gt AsH_3 gt PH_3` Decreasing paramagnetic character : `Fe^(3+)gtMn^(3+)gtCr^(3+)GTV^(3+)` Decreasing mobility of IONS in water : `Cs^(+)gt Rb^(+)gtK^(+)Na^(+)` Decreasing bond energy :`N_2gtN_2^(+)gtN_2^(-)gtN_2^(2-)` Solution :(A)`SbH_3` has highest boiling point on account of highest magnitude of vander Waals force of attraction due to highest molecular mass. Next is of `NH_3` due to strong H-bonding. (B)Number of unpaired electron are 5,4,3 & 2 respectively. Paramagnetic character `prop` Number of unpaired electrons. ( C)Degree of hydration `prop 1/("SIZE of CATION ")` Bigger hydrated ion moves slowly. (D)Bond order is directly proportional to the bond energy. Bond order of `N_2 =3, N_2^(+)=2.5, N_2^(2-)=2` But `N_2^-` has more electrons in antibonding MO's and thus `N_2^+` is more stable than `N_2^-`.