<prompt> Double based smokeless gun powder consists of:Nitrocellulose plus nitroglycerineNitrocellulose plus sulphurPotassium nitrate plus nitroglycerinePotassium nitrate plus charcoal  <response>: Ans. a. Nitrocellulose plus Nitroglycerine Ref: Reddy 33e p210, 29e p192Double based smokeless gun powder consists of Nitrocellulose plus Nitroglycerine.Gun-PowderSmokeless PowderSmoke producing powdersSemismokeless powderNitrocellulose gun cottonQNitrocellulose and Nitroglycerine double baseQ Black Powder:- It is described in FG, FFG, FFFG and so on depending on the size of die grains.- The finer and faster burning grains have more numbers of Fs.- It contains PCSQ- Potassium nitrate 75Q- Charcoal 15Q- Sulphur 10Q Pyrodex:- PCS - Potassium perchlorate, Sodium benzoate, Dicyandiamide, Dextrin wax and graphite80 of black and 20 of smokeless powderQ 