Which of the following is not the correct chemical formula for the compound named?

Question:
Which of the following is not the correct chemical formula for the compound named?
Select one:
a.
nickel(II) peroxide Ni2O
b.
ammonium chromate (NH4)2CrO4
c.
beryllium oxide BeO
d.
calcium sulfate CaSO4
e.
hydrocyanic acid HCN
Answer
a. nickel(II) peroxide Ni2O
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