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प्रश्न
State the various postulates of Dalton’s atomic theory of matter.
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उत्तर
Postulates of Dalton's atomic theory of matter :
- Matter comprises very small particles called atoms.
- Atoms of different elements differ in mass, size and chemical properties.
- Atoms can neither be created nor destroyed.
- Chemical reactions involve the combination, separation or rearrangement of atoms to form molecules or compounds.
- Atoms cannot be divided.
- A compound has a fixed number and kind of atoms.
- Atoms of the same element can combine in more than one ratio to form more than one compound.
- All the atoms in an element are identical in every aspect i.e. they have same mass, size and chemical properties.
- Like elements, there are many kinds of atoms.
- Atoms of different elements join together to form molecules of the compound in a chemical combination.
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संबंधित प्रश्न
Name the scientist who gave law of constant proportions.
Which part of the Dalton's atomic theory came from the law of constant proportions given by Proust ?
Name any two laws of chemical combination.
State the law of constant proportions. Give one example to illustrate this law.
Which postulate of Dalton’s atomic theory can explain the law of constant proportions ?
The atomic theory of matter was proposed by :
In an experiment, 4.90 g of copper oxide was obtained from 3.92 g of copper. In another experiment, 4.55 g of copper oxide gave, on reduction, 3.64 g of copper. Show with the help of calculations that these figures verify the law of constant proportions.
What do we call those particles which have less electrons than the normal atoms ?
What do we call those particles which are formed by the loss of electrons by atoms ?
Work out the formulae for the following compounds :
Sodium oxide
