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  4. When H2O2 is shaken with an acidified solution of K2 Cr2O7 in presence of ether, the ethereal layer turns blue due to the formation of

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Q. When $H_{2}O_{2}$ is shaken with an acidified solution of $K_{2} Cr_{2}O_{7}$ in presence of ether, the ethereal layer turns blue due to the formation of

WBJEEWBJEE 2012Hydrogen

Solution:

$K _{2} Cr _{2} O _{7}+ H _{2} SO _{4}+ 4 H _{2} O _{2} \rightarrow$
$K _{2} SO _{4}+5 H _{2} O +\underset{\text{dark blue}}{2 CrO _{5}}$