Q. 105.0( 1 Vote )
Identify the foll
(i) Cr₂O72– (dichromate ion) is the oxoanion of chromium which is stable in acidic medium.
⇒ Oxoanions of the metals are compounds in which the metals form bonds and interact with the available oxygen atom.
⇒ Therefore, they exist in their highest oxidation states.
⇒ In the dichromate salts, the dichromate anion is represented as Cr₂O72– and the oxidation state of Chromium in it is:
Let the oxidation state of chromium is x
Oxidation state of oxygen is -2
∴ 2x + 7 × (-2) = -2
⇒ 2x -14 = -2
⇒ 2x = -2 +14
⇒ 2x = 12
⇒ x = 6
Hence, the oxidation state of chromium is +6
⇒ It acts as a powerful oxidizing agent.
Thus,, Cr2O₇2– is stable in acidic medium.
(ii) The lanthanoid elements that exhibits +4 oxidation state are:
Cerium (Ce), Praseodymium (Pr), Terbium (Tb), Neodymium (Nd) and Dysprosium (Dy)
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