Discussion
Name the reagent formed by mixing 1 ml of formaldehyde solution with 9 ml of sulfuric acid :
Answer: B
The reagent is Marquis reagent.
Marquis reagent is formaldehyde in concentrated sulfuric acid. It is a colour test for drugs: opiates such as morphine and heroin give a purple to violet colour, and amphetamines an orange-brown, which makes it one of the standard screening tests.
Mandelin's reagent is ammonium vanadate in sulfuric acid. Duquenois reagent is vanillin and acetaldehyde in ethanol, used for cannabis. Zwikker's reagent is cobalt nitrate with pyridine (or a similar base), used for barbiturates. None of them is made from formaldehyde and sulfuric acid.
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