1.

(a) Name three oxy-acids of phosphorus and draw their structures. (b) Discuss the anomalous behaviour of oxygen.

Answer»

Solution :(i) Hypophosphorus, (ii) Phosphorus acid, (m) Phosphoric acid :

(b) Anomalous behaviour of oxygen is due to :
(b) It has small SIZE.
(ii) It has high ionisation ENERGY.
(iii) It has no vacant d-orbitals in its valence shell. Also the important points of difference are :
(i) Oxygen exists as diatomic molecules whereas other elements are POLYATOMIC.
(ii) Oxygen is gas whereas other members are solids at room temperature.
(iii) Max. O.S. of O is + 2 witereas other elements show max. O.S. of +6.
(iv) Oxygen is PARAMAGNETIC whereas other. elements are diamagnetic.


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