What is the product of the following reaction(different sources give different answers) [closed]








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$$\ce{FeS +dil HNO3}$$
$$\ce{FeS +conc HNO3}$$


I got different answers to these reactions in different sources


Source1 Jd lee:[![enter image description here](https://i.stack.imgur.com/GWoiB.png)](https://i.stack.imgur.com/GWoiB.png)


Source 2 Op Tandon:
[![enter image description here](https://i.stack.imgur.com/7ZvP7.jpg)](https://i.stack.imgur.com/7ZvP7.jpg)


Can anyone please explain which is the correct one and the reason for the same




Whatever the experimental conditions, $\ce{FeS}$ does react with any acid $\ce{HX}$ like $\ce{HNO3}$ according to $$\ce{FeS + 2 HX -> FeX2 + H2S}$$ This reaction proceeds like this if the acidic solution is rather diluted. If $\ce{HNO3}$ is more concentrated, both $\ce{H2S}$ and $\ce{Fe^{2+}}$ may be oxidized according to one of the following equations : $$\ce{H2S + 2 HNO3 -> S + 2 H2O + 2 NO2}$$ $$\ce{H2S + 8 HNO3 -> H2SO4 + 8 NO2 + 4 H2O}$$ $$\ce{Fe^{2+} + HNO3 + H+ -> Fe^{3+} + NO2 + H2O}$$
It is hard to know which ones of these equations is favored at a given concentration of nitric acid.


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