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प्रश्न
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
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उत्तर
| Compound | Formula | Elements present | |
| (a) | Water | H2O | Hydrogen(H) and Oxygen(O) |
| (b) | Ammonia | NH3 | Nitrogen(N) and Hydrogen(H) |
| (c) | Methane | CH4 | Carbon(C) and Hydrogen(H) |
| (d) | Sulphur dioxide | SO2 | Sulphur(S) and Oxygen(O) |
| (e) | Ethanol | C2H5OH | Carbon(C), Hydrogen(H) and Oxygen(O) |
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संबंधित प्रश्न
Give the name of the element present in the following compound:
Potassium sulphate
What do the following denote ?
- N
- 2N
- N2
- 2N2
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
An element A forms an oxide A2O5.
What is the valency of element A ?
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?
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
State the atomicity of the following:
Argon
State the atomicity of the following:
Sulphur
Which of the following is a short and scientific way of representing one molecule of an element or compound?
