Easy Qualitative Analysis

Chemistry Level 3

A coloured compound \(A\) reacts with dilute \(\text{H}_{2}\text{SO}_{4}\) to produce a colourless gas \(B\) and a colourless solution \(C\).

The reaction between \(B\) and acidified \(\text{K}_{2}\text{Cr}_{2}\text{O}_{7}\) solution produces a green solution and a slightly yellowish precipitate \(D\).

The substance \(D\) burns in air to produce a gas \(E\) which can also change the colour of \(\text{K}_{2}\text{Cr}_{2}\text{O}_{7}\) solution.

When the colourless solution \(C\) reacts with \(\text{Pb}_{3}\text{O}_{4} / \text{H}^{+}\), the solution acquires a violet red colour due to the formation of a substance. What is this substance?


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