Question

observation of when sulphur was warmed with concentrated nitric acid

Answer 1

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Concentrated nitric acid acts as an oxidizing agent for both sulfur & carbon. In the case of sulfur, S will get the oxygen atoms & the water needed for the reaction: S+6HNO3→H2SO4+2H2O+6NO2 so if sulfur is converted to SO2 first, it will proceed into SO3 & eventually to H2SO4.

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Answer 2

Answer:

when sulphur reacts with H2O3 it forms sulphuric acid nitrogen dioxide and water respectively.

S+6HNO3-H2SO4+6NO2+2H2O