1. Tardigrade
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  4. Assertion: In acidic medium, K2Cr2O7 exists as Cr2O72- (orange) while in basic medium it is converted to CrO42- (yellow). Reason: K2Cr2O7 is hygroscopic in nature and changes colour on reaction with water.

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Q. Assertion : In acidic medium, $K_2Cr_2O_7$ exists as $Cr_2O_7^{2-}$ (orange) while in basic medium it is converted to $CrO_4^{2-}$ (yellow).
Reason : $K_2Cr_2O_7$ is hygroscopic in nature and changes colour on reaction with water.

The d-and f-Block Elements

Solution:

$K_2Cr_2O_7$ changes colour only with change in $pH$ of aqueous solution.