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प्रश्न
Explain the term ‘variable valency’.
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उत्तर
“When an element has more than one valency, its valency is called variable valency.”
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संबंधित प्रश्न
Write the molecular formula for the oxide and sulphide of following elements of Calcium
The valency of aluminium is 3. Write the valency of other radicals present in the following compound.
Aluminium chloride
The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium sulphate.
Write the molecular formulae of Iron (II) sulphide.
Write the molecular formulae of Lead (II) oxide – PbO.
Write the molecular formulae of Calcium hydroxide.
Explain the term ‘symbol’.
With reference to water and ammonia as compounds respectively, state the valency of oxygen and nitrogen.
Complete the statement given below by filling in the blank with the correct word.
The formula of silver [I] chloride is ________.
Match the compounds in List I – 1 to 20 with their correct formulas in List II – A to T.
| List I | List II |
| 1. Copper [I] sulphide | A: KMnO4 |
| 2. Potassium permanganate | B: Mg3N2 |
| 3. Phosphoric acid | C: Mg(NO3)2 |
| 4. Copper [I] oxide | D: Al2(SO4)3 |
| 5. Carbonic acid | E: Na2ZnO2 |
| 6. Aluminium sulphide | F: N2O |
| 7. Iron [II] oxide | G: H2CO3 |
| 8. Iron [III] sulphide | H: Al2S3 |
| 9. Iron [II] sulphate | I: NO |
| 10. Sodium zincate | J: FeS |
| 11. Nitrous oxide | K: Fe2S3 |
| 12. Aluminium sulphate | L: H3PO4 |
| 13. Magnesium nitride | M: Cu2S |
| 14. Iron [III] sulphate | N: CuS |
| 15. Copper [II] oxide | O: Fe2O3 |
| 16. Iron [III] oxide | P: FeO |
| 17. Nitric oxide | Q: FeSO4 |
| 18. Copper [II] sulphide | R: Fe2(SO4)3 |
| 19. Iron [II] sulphide | S: CuO |
| 20. Magnesium nitrate | T: Cu2O |
