$$\ce{FeS +dil HNO3}$$ $$\ce{FeS +conc HNO3}$$
I got different answers to these reactions in different sources
Source1 Jd lee:
Source 2 Op Tandon:
Can anyone please explain which is the correct one and the reason for the same
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2$\begingroup$ Please don't use images in place of text, add conditions, cite the sources. $\endgroup$– andselisk ♦Commented Mar 9, 2022 at 6:54
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1$\begingroup$ What do you mean you "don't have idea about the sources"? Was it someone else who wrote this question for you? Source 1 looks like a handout from a lecture/presentation, and source 2 looks like a scan from a textbook. Add corresponding references for both, it's that simple. All third-party sources must be cited, the preferred citation style for references is ACS. $\endgroup$– andselisk ♦Commented Mar 9, 2022 at 7:28
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1$\begingroup$ As for markup, please visit this page, this page and this one on how to format your future posts better with MathJax and Markdown. Please spare colloquialisms and slang for informal chatting, this isn't the right place for either. $\endgroup$– andselisk ♦Commented Mar 9, 2022 at 7:29
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1 Answer
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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.
