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प्रश्न
Write the chemical formula of the following compound in a step-by-step manner –
Copper [I] sulphide
उत्तर
Write the formula of
| Copper [I] sulphide | Symbol | Valency |
| Copper | \[\ce{Cu}\] | \[\ce{1^{+}}\] |
| Sulphide | \[\ce{S}\] | \[\ce{2^{-}}\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{Cu}^{1+}\] \[\ce{S}^{2-}\]
Step II – Interchange the valencies ignoring the signs.
The Formula is \[\ce{Cu2S}\]
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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 |
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| 10. The valency of noble gases | J: K1+ |
