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Question
Write the chemical formula of the following compound in a step-by-step manner –
Potassium nitrate
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Solution
Write the formula of
| Potassium nitrate | Symbol | Valency |
| Potassium | \[\ce{K}\] | \[\ce1^+\] |
| Nitrate | \[\ce{NO3}\] | \[\ce1^-\] |
Step I – Write each symbol with its valency.
Positive ion is written first
\[\ce{K}^{1+}\] \[\ce{[NO3]}^{1-}\]
Step II – Interchange the valencies and ignoring the +ve and −ve signs
The Formula is \[\ce{KNO3}\]
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| Column I | Column II |
| 1. Elements having valency of two. | A: Br1− |
| 2. An anion | B: Divalent |
| 3. A gaseous non-metal | C: Reactants |
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| 2. Potassium permanganate | B: Mg3N2 |
| 3. Phosphoric acid | C: Mg(NO3)2 |
| 4. Copper [I] oxide | D: Al2(SO4)3 |
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| 10. Sodium zincate | J: FeS |
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| 15. Copper [II] oxide | O: Fe2O3 |
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| 17. Nitric oxide | Q: FeSO4 |
| 18. Copper [II] sulphide | R: Fe2(SO4)3 |
| 19. Iron [II] sulphide | S: CuO |
| 20. Magnesium nitrate | T: Cu2O |
