<prompt> As per ISO, color of NO2 cylinder is?BlueBlackWhiteRed  <response>: Ans. A. Blue. Ref. Lee anaesthesia 12thpg. 104COLOR AND PRESSURE OF CYLINDERS CylinderCOLORPRESSURE BAR1CyclopropaneOrange52NOBlue543 Grey504HalothaneAmber Red-5EthyleneRed-6HeliumBrown1377deg2Black body with white shoulder1378Entonox 50O250N2OBlue with white shoulder1379ThiopentoneYellow-10N2Black-11AirGrey with white shoulder137 