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A pale yellow substance (A) when heated ...

A pale yellow substance `(A)` when heated with `conc. HNO_3` evolves a brown coloured gas `(B)`. The substance `(A)` also dissolves in sodium sulphite solution on heating. A clear solution `(C)` is formed which on acidification gives a turbid solution and a pungent smelled gas `(D)` which is formed by the substance `(A)` in air. The solution `(C)` decolourises iodine solution, Identify `(A)` to `(D)`.

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To solve the problem step by step, we will identify each substance (A to D) based on the information provided in the question. ### Step 1: Identify Substance A The question states that substance (A) is a pale yellow substance that, when heated with concentrated HNO3, evolves a brown-colored gas (B). The pale yellow color suggests that substance A is likely sulfur (S), which is known to be pale yellow in color. **Hint:** Look for a pale yellow element that reacts with concentrated nitric acid. ### Step 2: Identify Gas B ...
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