Assertion :To a solution of potassium chromate, if a strong acid is added, it changes its color from yellow to orange. Reason: The color change is due to the change in oxidation state of potassium chromate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason are correct.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
To a solution of potassium chromate if a strong acid is added, it changes its color from yellow to orange. The color change is due to the change in the oxidation state of potassium chromate, there is no change in the oxidation state of chromium which is $+ 6$ in both cases.

$2 C r O_{4}^{2 -} y e l l o w + {S O}_{4}^{2 -} + 2 H^{+} \to 2 C r O_{7}^{2 -} o r a n g e + S O_{4}^{2 -} + H_{2} O$

The oxidation state of chromium which is +6 in both cases and therefore the 'reason' is incorrect.

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