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प्रश्न
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
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उत्तर
Helium (He) is considered monoatomic because it contains one atom while hydrogen contains two-atom (H2) therefore it considered as a diatomic molecule.
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संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
Al2(SO4)3
Write down the name of a compound represented by the following formula:
K2SO4
Give the name of the element present in the following compound:
Potassium sulphate
Define: Atomic weight :
What is meant by atomicity ? Explain with two examples.
In what form does oxygen gas occur in nature ?
What do the following denote ?
- N
- 2N
- N2
- 2N2
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence are produced. When 50 g of reactant P was heated strongly, than 22 g of a gas Q and 28 g of a solid R were produced as products. Gas Q is the same which produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for white-washing.
- What is (i) solid P (ii) gas Q, and (iii) solid R.
- What is the total mass of Q and R obtained from 50 g of P ?
- How does the total mass of Q and R formed compare with the mass of P taken ?
- What conclusion do you get from the comparison of masses of products and reactant ?
- Which law of chemical combination is illustrated by the example given in this problem ?
What are (i) ionic compounds, and (ii) molecular compounds ? Give two examples of each type of compounds.
The cation of an element has :
An element A forms an oxide A2O5.
What is the valency of element A ?
Why are the symbols and formulae of substances important?
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
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State the atomicity of the following:
Oxygen
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?
State true of false. If false, give the correct statement.
NaCl represents one molecule of sodium chloride.
The Atomicity of phosphorous is ______
Two elements sometimes can form more than one compound.
Give any two examples for heterodiatomic molecules.
Derive the relationship between Relative molecular mass and Vapour density.
Which of the following contains maximum number of molecules?
Write any two classifications of a molecule.
