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K 2 Cr 2 O 7 is an oxidizing agent, not used as a reducing agent.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Preparation and Properties of Potassium Dichromate and Permanganate
Let oxidation state of Cr be x. 2(+1) + 2x + 7(-2) = 0 → x = +6.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction
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