Answer:
Strange question. All the answers are D
Step-by-step explanation:
I don't exactly know how you should answer this. I can find the charge on Chromium. The only hope is that they are all the same.
[Cr(OH)_-6]^-3
x - 6 = -3 Add 6
x = -3 + 6
x = 3
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CrO4 ^-2
x - 4*2 = - 2 add 8
x = -2 + 8
x = 6
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Water has no effect on the charge. The chromium has a charge of +2