Determine the oxidation state of chromium in K2CrO4.

NY Chemistry Regents Exam Jan 2023

52 Determine the oxidation state of chromium in K2CrO4.

We can look at the periodic table to find oxidation numbers for K and O. K is +1 and O is -2.

Next we can make an equation to find Cr oxidation number. The overall charge of the molecule is 0 since the charge is not shown.

2(+1) + X + 4*(-2) = 0

X is the oxidation number for Cr

We get, 2+x-8 = 0

x-6=0

x=6

The oxidation number of Cr is +6