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  4. The oxidation state of chromium is +6 in:

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Q. The oxidation state of chromium is $+6$ in:

The d-and f-Block Elements

Solution:

$K _{2} CrO _{4}$

$2(+1)+ x +4(-2)=0$

$2+ x -8=0$

$x -6=0$

$x =+6$

$K _{2} Cr _{2} O _{7}$

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

$2+2 x -14=0$

$2 x -12=0$

$x =+6$