Which of the following order is correct-

1.	Which of the following order is correct-
Answer» `AlCl_(3) lt MgCl_(2) lt NaCl` , polarising power `CO gt CO_(2) gt HCO_(2)^(-) gt CO_(3)^(2-)`: bond length `BeCl_(2) lt NF_(3) lt NH_(3)`: dipole moment `H_(2)S gt NH_(3) gt SiH_(4) gt BF_(3)`: bond angle Solution :Polarising power of cations increases with the increasing charge. `overset((+1))(NaCl) lt overset((+2))(MgCl_(2)) lt overset((+3))(AlCl_(2))` Bond order`PROP(1)/("Bond length")` Bond order=`("bond order of each C-O bond")/("Total no. of resonating structures")` `CO to C-=O implies (2+1)/(1)=3.0` `CO_(2) to O =C=O implies (2+2)/(2)=2.0` Hence, the decreasing order of bond length is, `CO_(3)^(2-) gt HCO_(2)^(-) gt CO_(2) gt CO` (c) Correct order of dipole moment: `BeCl_(2) lt NF_(3) lt NH_(3)` (d) Correct order of bond angle: `underset(120^(@))(BF_(3)) gt underset(109^(@)28')(SiH_(4)) gt underset(107^(@))(NH_(3)) gt underset(94^(@))(H_(2)S)`

Discussion