Which of the following is use of potassium dichromate ?
Which of the following is use of potassium dichromate ?
A. To oxidise ferrous ions into ferric ions in acidic medium as an oxidising agent
B. As an insecticide
C. In electroplating
D. As a reducing agent
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Correct Answer - A
`K_2Cr_2O_7` i.e. `Cr_2O_7^(2-)` oxidise `Fe^(2+)` to `Fe^(3+)`
`Cr_2O_7^(2-) + 14 H^(+) + 6 Fe^(2-) to 2Cr^(3+) + 6Fe^(3+) + 7H_2O`
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