<prompt> Double base smokeless gun powder contains:Nitrocellulose and nitroguanidinePotassium nitrate and sulphurPotassium nitrate and charcoalNitrocellulose and nitroglycerin  <response>: Ans. D. Nitrocellulose and nitroglycerinRef: Review of Forensic Medicine toxicology; Gautum Biswas; 2nd edition; Pg-215BLACK gunpowder: Potassium nitrate 75, Charcoal 15 Sulfur 10SMOKELESS gun powder:Single base: NitrocelluloseDouble base: Nitrocellulose NitroglycrineTriple base: Nitrocellulose Nitroglycerine NitroguanidineSEMISMOKELESS gunpowder: 80 black 20 smokeless gunpowder. 