JEE Advanced levelSingle correct optionDifficulty 3 of 3ph043
Iodine reacts with hot concentrated nitric acid to give iodic acid, HIOX3, and nitrogen dioxide. How many moles of NOX2 are formed per mole of IX2 oxidised?
A10
B2
C5
D6
Answer: A
Each I goes from 0 to +5, so one IX2 loses 10 electrons. Each N goes from +5 to +4 in NOX2, gaining 1 electron. So 10 NOX2 are formed: IX2+10HNOX32HIOX3+10NOX2+4HX2O.