<prompt> Yellow discoloration of skin and mucosa is seen in which poisoning?Nitrous oxideNitric acidSulphuric acidPhosphoric acid  <response>: Nitric Acid Synonyms: Aqua Fois, Red Spirit of Nitre Propeies Clear, colourless, fuming liquid Pungent odour With organic substances, it causes yellowish discolouration due to xanthoproteic reaction. Fatal dose: 10 to 15 ml Fatal period: 12 to 24 hours. Autopsy Findings Corrosion of skin, angle of mouth, lips, mucosa with yellowish discolouration Stomach wall is soft and friable, ulcerated. Perforation is less common. REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;PAGE NO 298 