<prompt> At the end of anaesthesia after discontinuation of nitrous oxide and removal of endotracheal tube, 10000 oxygen is administered to the patient to prevent:Diffusion HypoxiaSecond gas effectHyperoxiaBronchospasm  <response>: Ref : Willer 10th ed On discontinuation of N2O administration, nitrous oxide gas can diffuse from blood to the alveoli, diluting O2 in the lung. Produce an effect called Diffusional hypoxia. To avoid hypoxia, 100 O2, rather than air should be administered when N2O discontinued. 