1. Tardigrade
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  3. Chemistry
  4. An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3 % H 2 O 2, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ' X '. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of X ?

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Q. An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of $1 \,mL$ of $3 \% H _{2} O _{2}$, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ' $X$ '. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of $X$ ?

JEE AdvancedJEE Advanced 2020

Solution:

$CrO_4^{2-} \ce{<=>[H^+][OH]} Cr_2O_7^{2-}$
$Cr_2O_7^{2-} + H_2O + H^+ \rightarrow \underset{\text{Chromium peroxide(blue)}}{CrO_5}$
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So, number of oxygen atoms attached to $Cr$ through single bond $= 4$