JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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Understanding +4 | -1

\mathrm{CrO}_4^{2-}

(yellow) changes to

\mathrm{Cr}_2 \mathrm{O}_7^{2-}

(orange) in

\mathrm{pH}=\mathrm{x}

and vice-versa in

\mathrm{pH}=\mathrm{y}

. Hence,

\mathrm{x}

and

\mathrm{y}

may be

View answer and explanation

Correct option: A

5, 9

Option A (5, 9) is correct because chromate ions (

CrO_4^{2-}

) convert to dichromate ions (

Cr_2O_7^{2-}

) in acidic conditions (low pH, around 5), and the reverse occurs in basic conditions (high pH, around 9).

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