When FeCl3 reacts with K3[Fe(CN)6] no blue colour is observed. K3[Fe(CN)6] is used as an indicator in the estimation of Fe2+ by Cr2O7 2- ion in an acidic medium. End point will be when:
Correct answer: A. Solution of iron salt does not give blue colour with indicator.
- A. Solution of iron salt does not give blue colour with indicator.
- B. Solution of iron salt gives blue colour with indicator.
- C. No colour before and after with indicator.
- D. Always blue colour before and after
Explanation
At the end point, there is no Fe2+. All iron in Fe3+ hence no blue colour with K3[Fe(CN)6] hence (A).
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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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