Yellow colour of chromate changes to ora

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Target Exam

CUET

Subject

Chemistry

Chapter

Inorganic: D and F Block Elements

Question:

Yellow colour of chromate changes to orange on acidification due to which of the following?

Options:

Cr³⁺

Cr₂O₃

Cr₂O₇^2-

CrO₄^-

Correct Answer:

Cr₂O₇^2-

Explanation:

The yellow colored solution of chromate salt changes to orange color on acidification due to the formation of $C r_{2} O_{7}^{2 -}$ . In acidic medium, chromate ion changes to dichromate ion.
$y e l l o w 2 C r O_{4}^{2 -} + 2 H^{+} \to o r a n g e r e d C r_{2} O_{7}^{2 -} + H_{2} O$

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