Q37 of 74 Page 207

Which one of the following does not exist?

(i) XeOF4 (ii) NeF2 (iii) XeF2 (iv) XeF6

NeF2does not exist as it would require d orbital for bonding which Ne does not have as it belongs to period 2 and moreover a lot of energy would be used to excite the electrons to a higher energy level as the valence electrons are very close to the nucleus thus they experience strong electrostatic attraction.


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35

How are XeO3 and XeOF4 prepared?

 36

Arrange the following in the order of property indicated for each set:

(i) F2, Cl2, Br2, I2 - increasing bond dissociation enthalpy.


(ii) HF, HCl, HBr, HI - increasing acid strength.


(iii) NH3, PH3, AsH3, SbH3, BiH3 – increasing base strength.

 38

Give the formula and describe the structure of a noble gas species which is isostructural with:

(i) ICl–4


(ii) IBr–2


(iii) BrO–3

 39

Why do noble gases have comparatively large atomic sizes?