When lead acetate solution is added to t...

When lead acetate solution is added to the fusion extract of thiamine, acidified with acetic acid, the colour of the precipitate obtained is

White

Yellow

Black

Reddish brown

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For the detection of sulphur, using lead acetate solution, the fusion extract is acidified with

A salt (A) when heated with K_2 Cr_2 O_7 and conc. H_2 SO_4 liberates a gas which is absorbed in NaOH solution. The NaOll solution turns yellow. When this solution is acidified with acetic acid and lead acetate solution is added, a yellow precipitate (B) is formed. (A) is mixed with MnO_2 and heated with conc. H_2 SO_4 when a gas (C) is evolved which tums starch-iodide paper blue. The compound formed, which turns NaOH solution yellow, is:

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When acetic acid reacts with ketene, product formed is:

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BRILLIANT PUBLICATION-ORGANIC CHEMISTRY: BASIC PRINCIPLES - PART III (PURIFICATION AND CHARACTERISATION OF ORGANIC COMPOUND)-LEVEL - II

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