Purification And Characterisation Of Organic Compounds Questions

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[Medium]Elemental analysis of an organic compound shows 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass; what is the empirical formula of this compound ...
[Medium]In the combustion method, 0.20 g of an organic compound on complete combustion produced 0.366 g of carbon dioxide; what is the percentage of carbon in...
[Medium]In Carius method, 0.15 g of an organic compound containing chlorine gave 0.12 g of silver chloride; what is the percentage of chlorine in the compound...
[Medium]Kjeldahl's method gives accurate nitrogen estimation for many compounds but fails for certain classes; for which type of compound is it not applicable...
[Medium]In Kjeldahl's method, 0.30 g of an organic compound liberated ammonia that exactly neutralised 30 mL of 0.1 N sulphuric acid; what is the percentage o...
[Medium]Halogens in an organic compound are not detected by directly adding silver nitrate to the compound but only after sodium fusion; what is the chief rea...
[Medium]A sodium fusion extract of an organic compound is treated with sodium nitroprusside and a violet colouration appears; what does this observation relia...
[Easy]When nitrogen in an organic compound is detected by Lassaigne's test, the appearance of a Prussian blue colour confirms its presence; which species is...
[Easy]A solid organic product is contaminated with a soluble coloured impurity, and the chemist wants pure colourless crystals; which purification technique...
[Easy]Column chromatography separates a mixture as different components are adsorbed to different extents on the stationary phase; what is the correct basis...
[Medium]In a thin layer chromatography experiment a particular component travels 2.4 cm while the solvent front advances 8.0 cm from the baseline; what is the...
[Medium]An organic compound dissolved in an aqueous layer is to be recovered using an immiscible organic solvent in a separating funnel; on what principle doe...
[Easy]A mixture contains camphor along with a non-volatile sand impurity, and the chemist needs to recover pure camphor; which property of camphor makes sub...
[Easy]Glycerol decomposes when heated to its normal boiling point at atmospheric pressure, so which purification method allows it to be distilled safely wit...
[Medium]Aniline is purified by steam distillation; at the operating point the aqueous tension is 717 mm Hg, so what is the partial pressure of aniline vapour ...
[Easy]Two miscible liquids in a mixture have boiling points of 351 K and 329 K with only a small difference between them; which technique separates them eff...
[Easy]In differential extraction using separating funnel, the compound preferentially dissolves in:...
[Easy]UV-Visible spectroscopy is useful for detecting:...
[Easy]Paper chromatography is based on the principle of:...
[Medium]A compound contains C=40%, H=6.7%, O=53.3%. The empirical formula is:...
[Easy]Sublimation can be used to purify:...
[Medium]Kjeldahl's method cannot be used for nitrogen estimation in:...
[Easy]A pure organic solid has:...
[Medium]In Dumas method for nitrogen estimation, nitrogen is collected as:...
[Easy]Simple distillation is used to purify liquids having boiling point difference of at least:...
[Easy]In column chromatography, the stationary phase is:...
[Easy]Lassaigne's test is used to detect:...
[Easy]In Carius method for halogen estimation, the precipitate formed is:...
[Easy]The principle of crystallization as a purification method is based on:...
[Easy]In thin layer chromatography (TLC), Rf value is calculated as:...
[Easy]Steam distillation is used for purification of:...