Answer :

(i) In the resonance structure of these two species, in NO2-, 2 bonds are sharing a double bond while in NO3-, 3 bonds are sharing a double bond which means that bond in NO2- will be shorter than in NO2- or we can say that in NO2- bond order is 1.5 while in NO2- bond order is 1.33


(ii) SF6 is kinetically inert due to high oxidizing power and electronegativity of fluorine atom which causes steric hindrance and it unable to react further with any other atom


OR


i) It is because PCl5has a trigonal bipyramidal structure and all bonds are not in same plane. Three P-Cl equatorial bonds are in one plane whereas two axial bonds are in vertical plane which are longer than equatorial bonds


ii) Sulphur has a much greater tendency for catenation than oxygen because of its bigger size and low electronegativity due to which the S-S bond is stronger than O-O bond and there is more interelectronic repulsion in O-O than in S-S bond


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