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  4. The oxidation state of Cr in K2Cr2O7 is

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Q. The oxidation state of $ Cr $ in $ K_2Cr_2O_7 $ is

MHT CETMHT CET 2012

Solution:

$K _{ 2 } C r _{ 2 } O _{7}$

Let the oxidation state of $Cr$ is $x$.

$2(+1)+2 x+7(-2) =0 $

$+2+2 x-14 =0$

$2 x-12 =0$

$x =+6$