<prompt> PIN index of nitrous oxide is?5-Jan5-Feb5-Mar6-Jan  <response>: ANSWER: C 3-5REF: Morgan 4th ed p, 20PIN INDEX Air1-5NITROUS OXIDEOxygen2-5 Stored in blue cylinder Pin index: 3-5 Liquid gas 745 psi pressure 1590 lit is the volumeNitrous oxide3-5Carbon di oxide1-6Helox2-4Entonox7 