641.
The variation of the boiling point of the hydrogen halides is in the order $$HF > HI > HBr > HCl.$$ What explains the higher boiling point of hydrogen fluoride?
A
The electronegativity of fluorine is much higher than for other elements in the group
B
There is strong hydrogen bonding between $$HF$$ molecules
C
The bond energy of $$HF$$ molecules is greater than in other hydrogen halides
D
The effect of nuclear shielding is much reduced in fluorine which polarises the $$HF$$ molecule
Answer :
There is strong hydrogen bonding between $$HF$$ molecules
Nitric oxide is paramagnetic in the gaseous state because of the presence of one unpaired electron in its outermost shell.
The electronic configuration of $$NO$$ is
$$\sigma _{1s}^2\sigma _{1s}^{ * 2}\sigma _{2s}^2\sigma _{2s}^{ * 2}\sigma _{2{p_z}}^2\pi _{2{p_x}}^2 = \pi _{2{p_y}}^2\pi _{2{p_x}}^{ * 1}$$