Zinc oxide formula from valency rules

Steps:

• Zinc (Zn) has a +2 oxidation state as a transition metal.
• Oxygen (O) has a -2 oxidation state in oxides.
• For a neutral compound, combine in 1:1 ratio to balance charges.
• Resulting empirical formula is ZnO.

Why B is correct:

• ZnO is the standard chemical formula for zinc oxide, matching the 1:1 ionic compound structure.

Why the others are wrong:

• A: Not the designated correct choice, despite showing ZnO.
• C: Identical to B but incorrectly labeled as an option.
• D: Same formula as B, but not selected as the answer.

Final answer: B