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  4. What is the oxidation number of Cr in Na 2 Cr 2 O 7 ?

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Q. What is the oxidation number of $Cr$ in $Na _{2} Cr _{2} O _{7} ?$

JIPMERJIPMER 2019Chemical Bonding and Molecular Structure

Solution:

Solution $Na _{2} Cr _{2} O _{7}$ $2(+1)+2 x+7(-2)=0=x=+6$