MCQ
White prepipitate is formed in.
- AMillon's test
- BNinhydrin test
- CBiuret test
- DXanthoprotic test
Explanation:
In Millon's test, first the compound (to be tested) i.e, protein is nitrated by HNO3 and then complexed with Hg(I) and Hg(II) ions.
A red precipitate is obtained. However, if the protein contains tyrosine, sometimes initially a white precipitate is formed that turns red on heating.
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Reason $(R)$ : Oxygen forms $\mathrm{p} \pi-\mathrm{p} \pi$ multiple bonds with itself and other elements having small size and high electronegativity like $\mathrm{C}, \mathrm{N}$, which is not possible for sulphur.
In the light of the above statements, choose the most appropriate answer from the options given below :
$(A)$ The $M ^{3+} / M ^{2+}$ reduction potential for iron is greater than manganese
$(B)$ The higher oxidation states of first row $d$ block elements get stabilized by oxide ion.
$(C)$ Aqueous solution of $Cr ^{2+}$ can liberate hydrogen from dilute acid.
$(D)$ Magnetic moment of $V ^{2+}$ is observed between $4.4-5.2\,BM$
Choose the correct answer from the options given below: