D And F Block Elements Question 8
Question 8 - 2024 (29 Jan Shift 1)
In chromyl chloride test for confirmation of $Cl^{-}$ ion, a yellow solution is obtained. Acidification of the solution and addition of amyl alcohol and $10 \% H _2 O _2$ turns organic layer blue indicating formation of chromium pentoxide. The oxidation state of chromium in that is
(1) +6
(2) +5
(3) +10
(4) +3
Show Answer
Answer (1)
Solution
$Cl^{-}+K _2 Cr _2 O _7+H _2 SO _4 \rightarrow CrO _2 Cl _2 \xrightarrow{\text { Basic medium }} \underset{\text { yellow solution }}{CrO _4^{2-}}+Cl^{-}$
