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Explain why: (1) Nitrogen does not form pentahalides. (2) Helium is used for filling weather…

Chemistry20185 marksShort answer
(i)
Explain why: (1) Nitrogen does not form pentahalides. (2) Helium is used for filling weather balloons. (3) ICl is more reactive than $\text{I}_2$.
(ii)
Draw the structures of the following: (1) $\text{HClO}_4$ (2) $\text{H}_3\text{PO}_3$

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Group-15 Elements

From ISC 2018 Chemistry Paper 1, question 17(a).