1.

When \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is converted to \[{{K}_{2}}Cr{{O}_{4}},\] the change in the oxidation state of chromium is       [NCERT 1981]

A.                 0             
B.                 6
C.                 4             
D.                 3
Answer» B.                 6


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