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Question
Write the chemical formula of the following compound in a step-by-step manner –
Iron [III] oxide
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Solution
Write the formula of
| Iron [III] oxide | Symbol | Valency |
| Iron | \[\ce{Fe}\] | \[\ce{3^{+}}\] |
| Oxide | \[\ce{O}\] | \[\ce{2^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Fe}^{3+}\] \[\ce{O}^{2-}\]
Step II – Interchange the valencies ignoring (+) and (−) signs.
The Formula is \[\ce{Fe2O3}\]
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Match the statements – 1 to 10 below with their correct answers from – A to J.
| Column I | Column II |
| 1. Elements having valency of two. | A: Br1− |
| 2. An anion | B: Divalent |
| 3. A gaseous non-metal | C: Reactants |
| 4. A cation. | D: Ammonium |
| 5. The term used for the substances which take part in the chemical reaction | E: Nitric oxide |
| 6. The meaning of the symbol ‘Δ’ over the arrow in a chemical equation. | F: Nitrogen |
| 7. The chemical name for nitrogen monoxide. | G: Zero |
| 8. A radical containing nitrogen and hydrogen only | H: Nitrous oxide |
| 9. The chemical name for dinitrogen oxide | I: Heat required |
| 10. The valency of noble gases | J: K1+ |
