Purification and Characterisation of Organic Compounds
Purification methods — crystallisation, sublimation, distillation, differential extraction and chromatography (principles only); qualitative analysis — detection of nitrogen, sulphur, phosphorus and halogens; quantitative analysis (basic principles only); calculation of empirical formulae and molecular formulae.
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Take a full mock →Q1 · Purification and Characterisation of Organic Compounds · MEDIUM
In Lassaigne's test for detection of nitrogen in an organic compound, the organic compound is fused with sodium metal. The sodium fusion extract when treated with ferrous sulphate solution followed by acidification with dilute sulphuric acid gives a Prussian blue precipitate. This confirms the presence of nitrogen because:
Q2 · Purification and Characterisation of Organic Compounds · EASY
An organic compound contains 40% carbon, 6.67% hydrogen and 53.33% oxygen by mass. If the molecular mass of the compound is 90 g/mol, what is its molecular formula?
Q3 · Purification and Characterisation of Organic Compounds · HARD
In Lassaigne's test, if an organic compound contains both nitrogen and sulphur, the sodium fusion extract gives a blood red colouration with FeCl3 solution instead of Prussian blue. This is because:
Q4 · Purification and Characterisation of Organic Compounds · EASY
Which of the following purification methods is based on the principle that different components of a mixture move at different rates on an adsorbent surface?
Q5 · Purification and Characterisation of Organic Compounds · EASY
Which of the following techniques is most suitable for the purification of a solid organic compound that sublimes readily at atmospheric pressure?