<prompt> Fatal dose of potassium cyanide is?5 mg10 mg20 mg200 mg  <response>: ANSWER: D 200 mgREF: Textbook Of Forensic Medicine and Toxicology: Principles and Practice by Vij page 695Fatal dose of cyanide:HCN gas - 100-200 ppm in airHCN liquid- 50-60 mgKCN, NaCN- 150-300 mg 200 mg as per Parikh 