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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Solution

$C r O_{4}^{2 -} + H_{2} O_{2} + H^{+} \to C r O_{5} + H_{3} O^{+}$
$(X = C r O_{5})$
Number of oxygen atoms bonded to chromium through only single bonds = 4

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CrO2−4+H2O2+H+→CrO5+H3O+ (X=CrO5) Number of oxygen atoms bonded to chromium through only single bonds = 4

$C r O_{4}^{2 -} + H_{2} O_{2} + H^{+} \to C r O_{5} + H_{3} O^{+}$
$(X = C r O_{5})$
Number of oxygen atoms bonded to chromium through only single bonds = 4