Transition and Inner Transition Elements — Chemistry STD 12 — Question
Tamilnadu BoardEnglish MediumSTD 12ChemistryTransition and Inner Transition Elements2 Marks
Question
Prove that acidified potassium dichromate is a powerful oxidising agent.
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Answer
$K _2 Cr _2 O _7$ act as power oxidising agent in acidic medium. In the presence of $H ^{+}$ions, the oxidation state of $Cr$ froms $Cr ^{6+}$ is changed to $Cr ^{3+}$ $ Cr _2 O _7^{2-}+14 H ^{+}+6^{-} \rightarrow 2 Cr ^{3+}+6 Fe ^{3+}+7 H _2 O $ Example: Acidified $K _2 Cr _2 O _7$ oxidises Ferrous salts to Ferric salts. $ Cr _2 O _7^{2-}+6 Fe ^{2+}+14 H ^{+} \rightarrow 2 Cr ^{3+}+6 Fe ^{3+}+7 H _2 O \text {. } $
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