Short Answer TypeThe chemistry of corrosion of iron is essentially an electrochemical phenomenon. Explain the reactions occurring during the corrosion of iron in the atmosphere.
State reasons for each of the following:
The N-O bond in is shorter than the N-O bond in
The shorter N - O bond in is due to the existence of resonance in. The resonating structures can be drawn as follows.
Due to resonance in, the two bonds are equivalent. This leads to a decrease in bond length.
Thus, the N - O bond length in resembles a double bond.
Now, the resonating structures for can be drawn as:
As seen from the above resonating structures of 
, the three oxygen atoms are sharing two single bonds and one double bond. So, the real N - O bond length resembles a single bond closely.
In 
the lone pair is delocalized between the 2 oxygen groups. Bond order equal to 1+1/2=3/2.
In 
lone pair shared between three oxygen atom hence bond order =1+1/3=4/3.
Greater the bond order shorter the bond. Hence bond length of 
less than that of 
This explains the existence of shorter bond length of the N - O bond 
in than in 
.
State reasons for each of the following:
(i) All the P-Cl bonds in PCl5 molecule are not equivalent.
(ii) Sulphur has a greater tendency for catenation than oxygen.
G° for the following reaction: 
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