<prompt> The Pin index code of Nitrous oxide is :2,5.1,5.3,5.2,6.  <response>: Ans. is c i.e. 3, 5 Pin index for the following gases are-Nitrous oxide - 3 and 5Oxygen - 2 and 5Cyclopropane - 3 and 6Carbon dioxide - 1 and 6 Also, RememberInternational color code for cylindersOxygen - black with white shouldersNitrous oxide - BlueCarbon dioxide - GrayCyclopropane- Orange 