<prompt> Color of nitrous oxide cylinder isBlack with white shouldersWhite with black shouldersGreyBlue  <response>: Ans. d Blue. Ref. Short textbook of anesthesia by Ajay Yadav, 2nd ed., 21Colour and pressure of cylindersSr. No.Anaesthetic gasColorPressure bar CyclopropaneOrange52.N2OBlue543.CO2Grey504.HalothaneAmber--5.EthyleneRed--6.HeliumBrown1377.O2Black body with white shoulder1378.Entonox 50O250N2OBlue with white shoulder1379.AirGrey with white shoulder137Colour code for vaporizer of anaesthetic agents1. Red for ralothane 2. Orange for enfluraneHINT: ROPY HE-IS3. Purple for isoflurane4. Yellow for sevoflurane 