1.

Explain why:(1) Nitrogen does not form pentahalides.(2) Helium is used for filling weather balloons.(3) ICI is more reactive than I2

Answer»

(1) Nitrogen does not form pentahalides because it has no vacant d-orbitals in its valence shell.

(2) This is because it is lighter than air.

(3) This is because ICl is polar and has lower bond energy than I2 (non-polar)



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