Advertisements
Advertisements
प्रश्न
Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.
Advertisements
उत्तर
Atoms of the same element or different elements combine to form a molecule.
Atoms of the same element forming a molecule
1. Oxygen
2. Nitrogen
3. Hydrogen.
Atomicity is the number of atoms present in one molecule of the element.
| Element | Molecule | Atomicity |
| Hydrogen H | H2 | 2 |
| Nitrogen N | N2 | 2 |
| Oxygen O | O2 | 2 |
संबंधित प्रश्न
Write down the name of a compound represented by the following formula:
K2SO4
Write down the name of a compound represented by the following formula:
KNO3
Define: Atomic number
Define: Mass number :
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 ?
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.
Calculate the mass of 3.011 × 1024 atoms of carbon.
Why are the symbols and formulae of substances important?
Give one example of a triatomic molecule
Give a reason why –
Helium is considered monoatomic, but hydrogen a diatomic molecule.
State the atomicity of the following:
Neon
State the atomicity of the following:
Chlorine
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?
Classify the following molecules as the molecules of element or compound
| 1. |  |
|
| 2. |  |
|
| 3. |  |
|
| 4. |  |
Derive the relationship between Relative molecular mass and Vapour density.
Write any two classifications of a molecule.
