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

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Both A and R are true, and R is the correct explanation of A

A is false but R is true

Both A and R are true, but R is not the correct explanation of A

A is true but R is false

answer is B.

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Detailed Solution

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.
$2 {CrO}_{4}^{2 -} + {SO}_{4}^{2 -} + 2 H^{+} \to 2 {Cr}_{2} O_{7}^{2 -} + {SO}_{4}^{2 -} + H_{2} O$
The oxidation state of chromium which is +6 in both cases and therefore the 'reason' is incorrect.