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  • An inorganic salt is yellow in colour but becomes orange in acidic medium and again yellow in basic medium. The salt is:Option: 1 <img alt="CuSO_{4}"

An inorganic salt is yellow in colour but becomes orange in acidic medium and again yellow in basic medium. The salt is:

Option: 1

CuSO_{4}


Option: 2

KMnO_{4}


Option: 3

FeCl_{3}


Option: 4

K_{2}CrO_{4}


Answers (1)

best_answer

2CrO_{4}^{2-}(aq)(yellow)+2H^{+}(aq)\rightarrow Cr_{2}O_{7}^{2-}(aq)(orange)+H_{2}O(I)

The addition of acid encourages the equilibrium towards the right, producing more orange-coloured dichromate(VI) ions. The addition of hydroxide ions causes the concentration of hydrogen ions to decrease, and this brings the equilibrium back to the left-hand side, regenerating yellow chromate(VI) ions.

Posted by

Ritika Kankaria

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