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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
Which postulate of Dalton’s atomic theory can explain the law of definite proportions?
Name the scientist who gave law of constant proportions.
Name the scientist who gave atomic theory of matter.
Which postulate of Dalton’s atomic theory can explain 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 gain of electrons by atoms ?
Two samples ‘m’ and ‘n’ of slaked lime were obtained from two different reactions. The details about their composition are as follows:
- ‘sample m’ mass: 7g
- Mass of constituent oxygen: 2g
- Mass of constituent calcium: 5g
- ‘sample n’ mass: 1.4g
- Mass of constituent oxygen: 0.4g
- Mass of constituent calcium: 1.0g
Which law of chemical combination does this prove? Explain.
The same proportion of carbon and oxygen in the carbon dioxide obtained from different sources proves the law of ______.
In water, hydrogen and oxygen are combined in the ratio of _____ by mass.
Ruthresh, Hari, Kanishka, and Thahera collected different samples of water from a well, a pond, a river, and underground water. All these samples were sent to a testing laboratory. The test result showed the ratio of hydrogen to oxygen as 1:8.
- What conclusion would you draw from the above experiment?
- Which law of chemical combination does it obey?
