Among the following, the species with the highest bond order is-

Correct Answer - D The formation of one mole of HCl can be represented as, `(1)/(2)(H-H)+(1)/(2)(Cl-Cl)toH-Cl,DeltaH=-90kJ` Hence, for the reaction, Heat evolved=heat evolved in bond formation-heat required for bond breaking `therefore...

Correct Answer - A `DeltaH_(("reaction"))=sum` bond energies of reactants `-sum`bond energies of produts. Given, `2H_(2)+O_(2)to2H_(2)O,DeltaH=-571` `H-H=435,O=O` is 498, O-H is? `DeltaH=(2xx"B E of "H_(2)+" B E of "O_(2))-2("B E of "H_(2)O)`...

Correct Answer - A `underset(120^(@))(BF_(3)) lt underset(109^(@)28)(NH_(4)^(+)) lt underset(107^(@))(NH_(3)) lt underset(92^(@))(PH_(3))`

Correct Answer - D N on `NO_(2)^(+)` is sp-hybridized , therefore, its bond angle is `180^(@)`. Both NO and `NO_(2)^(-)`, on the other hand, are `sp^(2)`-hybrisized. In `NO_(2)^(-)`, there is one...

Correct Answer - C HI bond length is maximum and H-F has highest bond energy

Correct Answer - A More is bond order, shorter will be the bond length `("B.O."prop 1/(B.L.))`

Correct Answer - B Increasing bond order is `O_2^(2-) (1.0) lt O_2^(-) (1.5) lt O_2(2.00) lt O_2^(+) (2.5)`

Correct Answer - A,B B.O. of `Ar_2=(N_a-N_a)/2 =(18-18)/2=0` B.O. of `F_2^(2-)=(N_b-N_a)/2 =(10-10)/2=0`

Correct Answer - C,D B.O. of `N_2^(+)=(N_b-N_a)/2 =(9-4)/2=2.5` B.O. of `O_2^(+)=(N_b-N_a)/2 =(9-4)/2.5` (Both are isoelectronic with 16 electrons each)

Correct Answer - B Due to delocalisation of `pi` electrons `C_(2)-C_(3)` bond acquired double bond character.