Advertisements
Advertisements
प्रश्न
With reference to water and ammonia as compounds respectively, state the valency of oxygen and nitrogen.
Advertisements
उत्तर
With reference to water (H2O) and ammonia (NH3):
- Valency of oxygen = 2, because it combines with two hydrogen atoms in water.
- Valency of nitrogen = 3, because it combines with three hydrogen atoms in ammonia.
APPEARS IN
संबंधित प्रश्न
Write the molecular formula of the following compounds of Iron (II) sulphide and.
Find the number and names of elements present in them and calculate their molecular masses.
The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium sulphate.
A solution of a substance ‘X’ is used for white washing.
(a) Name the substance ‘X’ and write its formula.
(b) Write the reaction of the substance ‘X’ named in (a) above with water.
Write the molecular formulae of Sodium hydroxide
Write the molecular formulae of Calcium hydroxide.
Write the chemical formula of the following compound in a step-by-step manner –
Calcium bicarbonate
Write the chemical formula of the following compound in a step-by-step manner –
Potassium permanganate
Write the chemical formula of the following compound in a step-by-step manner –
Sodium zincate
Write the chemical formula of the following compound in a step-by-step manner –
Iron [II] hydroxide
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 |
