Pin code index of N2O is: (A) 1,6, (B) 2,5, (C) 2,6, (D) 3,5
Answer is D. PIn index provides prevention of wrong attachments of cylinders . N20 - 3 ,5 O2 - 2 , 5 C02 (Gas) - 1 ,6 . ( Liquid below 88F ) 2 , 6 ; Cyclopropane 3 , 6 .