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प्रश्न
Define: Atomic weight :
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उत्तर
Atomic weight : It is the ratio that tells how many times an atom of an element is heavier than atom of Hydrogen
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
KNO3
Write down the name of a compound represented by the following formula:
CaCO3
Give the name of the element present in the following compound:
Hydrogen bromide
Give the name of the element present in the following compound:
Baking powder
Give the name of the element present in the following compound:
Potassium sulphate
Define: Atomic number
What is meant by atomicity ? Explain with two examples.
Write the formulae of the following compounds. Also name the elements present in them.
- Water
- Ammonia
- Methane
- Sulphur dioxide
- Ethanol
In what form does oxygen gas occur in nature ?
What do the following denote ?
- N
- 2N
- N2
- 2N2
What is the difference between the molecule of an element and the molecule of a compound? Give one example of each.
The cation of an element has :
Molecular compounds are usually formed by the combination between :
An element A forms an oxide A2O5.
What is the valency of element A ?
Calculate the mass of 3.011 × 1024 atoms of carbon.
Correct the following statement:
A molecule of sulphur is monoatomic.
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
Give one example of a triatomic molecule
Give one example of a polyatomic molecule.
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
State the atomicity of the following:
Argon
Classify the following molecules as the molecules of element or compound
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Two elements sometimes can form more than one compound.
Define: Atomicity.
Give any two examples for heterodiatomic molecules.
Derive the relationship between Relative molecular mass and Vapour density.
