In Carius tube, an organic compound ' X ' is treated with sodium peroxide to form a mineral acid ' Y '. The solution of is added to ' Y ' to form a precipitate ' Z '. ' Z ' is used for the quantitati

Question

In Carius tube, an organic compound ' X ' is treated with sodium peroxide to form a mineral acid ' Y '. The solution of  is added to ' Y ' to form a precipitate ' Z '. ' Z ' is used for the quantitative estimation of an extra element. ' X ' could be:

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Step 1: Trace the Reaction Sequence

- Compound X is treated with sodium peroxide (, an oxidising agent) in a Carius tube
- A mineral acid Y is formed
-  is added to Y → precipitate Z
- Z is used for quantitative estimation of an extra element

Step 2: Identify the Precipitate Z

When  is added to a mineral acid:
-  → white precipitate (BaSO₄)

So Z =  (barium sulphate), which is used for the quantitative estimation of sulphur.

This means X contains phosphorus that gets oxidised to a phosphate

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