True about N2O cylinder – a) Pressure is 2200 PSI b) Blue in colourc) Gas in liquid formd) Pin index 3.5e) It is flammable
**Core Concept**
The question pertains to the characteristics of a nitrous oxide (N2O) cylinder, which is a medical gas used for anesthesia and analgesia. The properties of N2O cylinders must adhere to specific standards to ensure safe handling and use.
**Why the Correct Answer is Right**
N2O cylinders have a pressure of 2216 PSI (pounds per square inch), but the closest option is 2200 PSI. N2O cylinders are typically blue in color to distinguish them from other medical gas cylinders. The gas in an N2O cylinder is in a liquid-vapor equilibrium state, which is why it is often referred to as a "liquid" but is actually a mixture of both. The pin index of an N2O cylinder is 3, not 3.5, which is crucial for safe connection to medical equipment. N2O is not flammable due to its low ignition temperature and high quenching coefficient.
**Why Each Wrong Option is Incorrect**
**Option A:** 2200 PSI is close to the actual pressure of N2O cylinders, but it is not the exact value.
**Option B:** While some medical gas cylinders are blue, the color is not a universal standard and can vary depending on the gas and manufacturer.
**Option C:** The liquid-vapor equilibrium state of N2O is a characteristic of the gas, but the term "liquid form" is somewhat misleading.
**Option D:** The pin index of 3.5 is incorrect, as the actual pin index for N2O cylinders is 3.
**Option E:** N2O is not flammable due to its properties, making this statement incorrect.
**Clinical Pearl / High-Yield Fact**
For medical gas cylinders, it is essential to verify the correct pin index and color to ensure safe and proper connection to medical equipment.
**Correct Answer:** D.