Consider the reaction of potassium dichromate with hydrogen peroxide in an acidic medium. Which of the following statements is correct regarding the product formed?

A. The product is a blue-colored Cr(VI) species with a butterfly structure. — The reaction produces chromium pentoxide which has a characteristic blue color and a butterfly structure.

B. The product is a green-colored Cr(III) complex.

C. The reaction involves the reduction of Cr(VI) to Cr(II).

D. The product is a stable yellow chromate salt.

JEE Main · ChemistryHard

$Consider the reaction of K_{2} Cr_{2} O_{7} with H_{2} O_{2} in an acidic medium. Which of the following statements is correct regarding the product formed?$

A. $The product is a blue-colored Cr(VI) species with a butterfly structure.$
B. $The product is a green-colored Cr(III) complex.$
C. $The reaction involves the reduction of Cr(VI) to Cr(II) .$
D. $The product is a stable yellow chromate salt.$

Show correct answer & step-by-step solution

Correct answer: A — $The product is a blue-colored Cr(VI) species with a butterfly structure.$

Solution

$The reaction is Cr_{2} O_{7}^{2 -} + 2 H^{+} + 4 H_{2} O_{2} \to 2 CrO_{5} + 5 H_{2} O .$
$The species CrO_{5} is chromium pentoxide.$
$It contains two peroxo groups and one double-bonded oxygen, forming a butterfly structure.$
$Hence the answer is (A).$

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