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Which of the following is incorrect for K2Cr2O7?
(A) Six (CrO) bonds are equivalent.
(B) CrOCr bond angle is 126 nearly.
(C) Orange color is due to dd transition.
(D) Oxygen is arranged tetrahedrally around chromium.

Answer
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Hint: K2Cr2O7 is an inorganic chemical reagent with the chemical name potassium dichromate. It is an odorless crystalline ionic solid with a bright red-orange color. It acts as a strong oxidizing agent. It is soluble in water but insoluble in acetone. It is highly corrosive in nature.

Complete answer: Potassium dichromate molecule has two ionic bonds between two positively charged potassium cations and the dichromate anion. The dichromate ion has two chromium atoms which are bonded to four different oxygen atoms. Two of the CrO bonds are double bonds. One of the oxygen atoms is bonded to both chromium atoms in the molecule. The structure of potassium dichromate is given below:
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There are six normal CrO bonds and there are two bridged CrO bonds in potassium dichromate. The six normal CrO are equivalent and different from bridged CrO bonds. The chromate ion has tetrahedral shape and the dichromate ion has two tetrahedral sharing at one corner, with CrOCrbond angle equal to 126 . The color of potassium dichromate is due to ligand to metal charge transfer. Oxygen is arranged tetrahedrally around chromium in potassium dichromate.
Therefore, option C is the correct answer.

Note:
Potassium dichromate is used in cement to retard the setting of the mixture and also to improve density along with texture. It is used to clean glassware. It is also used as a medicine as an antiseptic, astringent and caustic. It is also used in photographic screen printing. It is considered as a human carcinogen as it increases the risk of developing lung cancer.
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