Question

Concentrated $HNO_3$​ reacts with iodine to give:
A) HI
B) HIO
C) $HIO_3$
D) $HIO_2​$

Answer 1

Nitric acid is one of the strongest acids in chemistry.Initially we should know that $HNO_3$ is an acid. Iodine replaces the Nitrogen (N) easily in the reaction. Now you can easily find out the reaction.

Complete step by step answer:
Nitric acid which is also known as $HNO_3$. The pure compound is colourless, but older samples tend to accumulate a yellow cast because of decomposition into oxides of nitrogen and water. Most commercially available aqua fortis feature a concentration of 68% in water.
Iodine is one of the elements with the symbol I and number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black non-metallic solid. In this reaction iodine reacts easily with the acid and forms iodic acid, nitrogen dioxide and water.
The reaction involved is:
$10HNO_3 + I_2 \to 2HIO_3 + 10NO_2 + 4H_2O$

Note: Uses of Nitric Acid:
-For TDI (polyurethane raw material)
-For aniline (dye intermediate)
-For adipic acid
-For acid pickling, metal polishing, and plating
Uses of iodine:
-Iodine is used to treat and prevent iodine deficiency and as an antiseptic. For iodine deficiency it can be given by mouth or injection into muscles.
-As an antiseptic it may be used on wounds that are wet or to disinfect the skin before surgery.