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Question

(a) Complete the following chemical equations:
(i) XeF4+SbF5
(ii) Cl2+F2(excess)
(b) Explain each of the following:
(i) Nitrogen is much less reactive than phosphorus.
(ii) The stability of +5 oxidation state decreases down group 15.
(iii) The bond angles (ONO) are not of the same value in NO2 and NO+2.

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Solution

a) i) XeF4 or xenon tetrafluoride reacts with SbF5 which is an Lewis acid and forms adduct-
XeF4+SbF5[XeF3]++[SbF6]
ii) Cl2+3F22ClF3
B) i) Nitrogen is much less reactive than phosporous as it exists as N2 in which 2 nitrogen atoms are bonded with triple bond and are stable.
ii) The stability of +5 oxidation state decreases down the group due to inert pair effect.
iii) NO+2 has more bond angle (180 degrees) than NO2 because NO+2 has no lone pairs which do not disturb the regular bond angle of 180 degree but where as in NO2 there is one lone pairs so the l.p and b.p repulsion leads to decrease in bond angle from regular bond angle of 180o.

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