Advertisements
Advertisements
प्रश्न
An element A forms an oxide A2O5.
What is the valency of element A ?
Advertisements
उत्तर
Element A forms an oxide A2O5. Crossing the valencies, we can see that the valency of O (oxide) is −2 and that of element A is 5.
APPEARS IN
संबंधित प्रश्न
Define: Atomic weight :
What is the atomicity of the following ?
- Oxygen
- Ozone
- Neon
- Sulphur
- Phosphorus
- Sodium
In what form does oxygen gas occur in nature ?
Work out the formula for magnesium hydrogencarbonate.
An element X forms the following compounds with hydrogen, carbon and oxygen :
H2X, CX2, XO2, XO3
State the three valencies of element X which are illustrated by these compounds.
Why are the symbols and formulae of substances important?
State the main points of the contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
State the atomicity of the following:
Neon
Classify the following molecules as the molecules of element or compound
| 1. |  |
|
| 2. |  |
|
| 3. |  |
|
| 4. |  |
