Why does sulphur reacting with concentrated nitric acid give sulphuric acid instead of sulphur dioxide?(A) It has greater reactivity with acid.(B) End valency for oxidation 6. (C) End valency for oxidation 4. (D) All of the above.
The correct answer is (B) End valency for oxidation 6.
When sulfur reacts with concentrated nitric acid, it undergoes oxidation to form sulfuric acid (H₂SO₄) rather than sulfur dioxide (SO₂). This is because sulfur can exhibit multiple oxidation states, but in the presence of concentrated nitric acid, it typically undergoes oxidation to its highest stable oxidation state, which is +6. This oxidation state leads to the formation of sulfuric acid (H₂SO₄) rather than sulfur dioxide (SO₂).
So, option (B) "End valency for oxidation 6" correctly explains why sulfur reacts with concentrated nitric acid to form sulfuric acid instead of sulfur dioxide.
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