Question:
When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of ________.
When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of ________.
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When hydrogen peroxide is added to acidified potassium dichromate, a blue colour is produced due to formation of ____.
Updated On: Apr 15, 2026
- $CrO_{3}$
- $Cr_{2}O_{3}$
- $CrO_{5}$
- $CrO_{4}^{2-}$
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The Correct Option is C
Solution and Explanation
Step 1: Reaction
$H_{2}O_{2}$ reacts with acidified potassium dichromate ($K_{2}Cr_{2}O_{7}$).
Step 2: Product
The reaction produces chromium pentoxide ($CrO_{5}$), also known as chromic peroxide. $$Cr_{2}O_{7}^{2-} + 2H^{+} + 4H_{2}O_{2} \rightarrow 2CrO_{5} + 5H_{2}O$$
Step 3: Physical Property
$CrO_{5}$ has a deep blue colour in ethereal solution but is unstable.
Final Answer: (C)
$H_{2}O_{2}$ reacts with acidified potassium dichromate ($K_{2}Cr_{2}O_{7}$).
Step 2: Product
The reaction produces chromium pentoxide ($CrO_{5}$), also known as chromic peroxide. $$Cr_{2}O_{7}^{2-} + 2H^{+} + 4H_{2}O_{2} \rightarrow 2CrO_{5} + 5H_{2}O$$
Step 3: Physical Property
$CrO_{5}$ has a deep blue colour in ethereal solution but is unstable.
Final Answer: (C)
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