What is the reaction between nitric acid and fluorine?
It was first discovered by Cady that when fluorine is bubbled through $\pu{3 N}$ nitric acid, then a remarkable compound, fluorine nitrate ($\ce{FNO3}$) is formed. It boils at $\pu{-42 ^\circ C}$ and is a very strong oxidizing agent and is capable of liberating iodine from iodides and in gaseous states, it explodes around $\pu{200-300 ^\circ C}$.

References


The reaction of Fluorine with Nitric acid and with solid Potassium Nitrate to form NO3F by Don M. Yost and Alan Beerbower,  J. Am. Chem. Soc. April 1935, 57(4) 782. DOI: https://doi.org/10.1021/ja01307a520
Prof. Dr. Otto Ruff, Dr. Walter Kwasnikie,  Die Fluorierung der Salpetersäure. Das Nitroxyfluorid – NO3F, April 1935, DOI: https://doi.org/10.1002/ange.19350481604 [German paper]