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Chromium metal in basic medium is oxidis...

Chromium metal in basic medium is oxidised in air to give chromic tetrahydroxide anion.

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(a) This ionic skeleton equation is written as `Cr+O_(2) overset(OH^(-)) to Cr(OH)_(4)^(-)`
(b) Writing oxidation numbers
`overset(0)(Cr)+overset(0)(O_(2)) to [overset(+3)(Cr) (overset(-2)O overset(+1)(H))_(4)]^(-)`
(c ) Locating atoms undergoing change in oxidation numbers
`overset(0)(Cr)+overset(0)(O_(2)) to [overset(+3)(Cr) (overset(-2)O overset(+1)(H))_(4)]^(-)`
(d) Dividing the reaction into two halves and balancing in acidic medium, separately
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