The chemical formula of nitrous acid

Which of the following oxides of nitrogen is the mixed anhydride of nitrous acid and nitric acid?

What is the formula of the following compound? iodic acid

Whats the byproduct of nitric oxide

Which reagents are used to prepare nitrous acid in situ?Select answer from the options belowNaNO2 / HClHNO3 / H2ONO2 / NaN3 / HCl / H2O

For the decomposition of nitrous oxide N2O →N2+ 0.5O2, the rate equation is given by−𝑟𝑁2𝑂 = 𝑘1[𝑁2𝑂]21 + 𝑘2[𝑁2𝑂]Propose a mechanism for the reaction and derive the above expression