D. Pharma B. Pharma Pharmaceutical Chemistry (Inorganic) Bachelor of Pharmacy Diploma in Pharmacy
Ans → (b)Blue
Explanation → Nitrous oxide (laughing gas) is used as anesthatic agent in dentistry and supplied in blue coloured cylinders.
This question is taken from this post → Practice Test Set #1 | Pharmaceutical Chemistry 1 (inorganic) MCQs - attemp/practice