First slide

Hydrogen Peroxide

Question

The number of peroxy bonds present in the product formed when H₂O₂ reacts with acidified potassium dichromate are

Moderate

A

3
B

2
C

1
D

zero

Solution

$\large \mathop {C{r_2}}\limits^{ + 6} O_7^{ - 2} + 4{H_2}{O_2} + 2{H^ + }\xrightarrow{{Ether}}\mathop {2\mathop {Cr}\limits^{ + 6} {O_5}}\limits_{(Blue)} + 5{H_2}O\$
(or)
$\large {K_2}C{r_2}{O_7} + 4{H_2}{O_2} + {H_2}S{O_4}\xrightarrow{{Ether}}\mathop {2Cr{O_5}}\limits_{(Blue)} + 5{H_2}O + {K_2}S{O_4}\$
CrO₅ contains 2-peroxy bonds

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