The equilibrium Cr2O7 2- ↔ 2CrO42- is shifted to right in:
Correct answer: B. A basic medium
- A. An acidic medium
- B. A basic medium
- C. A neutral medium
- D. It does not exist
Explanation
The equilibrium ( text{Cr}_2text{O}_7{2-} leftrightarrow 2text{CrO}_4{2-}) involves the chromate (text{CrO}_4{2-}) and dichromate ( text{Cr}_2text{O}_7{2-} ) ions. In a basic medium, hydroxide ions ( OH- ) are present, which can react with the dichromate ion ( text{Cr}_2text{O}_7{2-}) to form chromate ions (text{CrO}_4{2-}), shifting the equilibrium to the right. This reaction occurs because the hydroxide ions act as a base, accepting a proton from the dichromate ion, converting it into chromate ion and water. Thus, option B is correct.
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Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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