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प्रश्न
State the law of constant proportions. Give one example to illustrate this law.
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उत्तर
Law of constant proportions states that a chemical compound always consists of the same elements combined together in the same proportion by mass. It was put forward by Joseph Proust in 1779
It means that a pure chemical compound is always made up of the same elements in the same mass percentage.
Law of constant proportions can be illustrated by the following example:
Carbon dioxide exists in nature in different forms and can be chemically produced in different ways. Yet, all the different samples of carbon dioxide will always contain the same elements i.e. carbon and oxygen in the same proportion by mass i.e. 3:8.
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संबंधित प्रश्न
When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combinations will govern your answer?
Which postulate of Dalton's atomic theory is the result of law of conservation of mass given by Lavoisier ?
Which part of the Dalton's atomic theory came from the law of constant proportions given by Proust ?
The law of constant proportions was given by :
What do we call those particles which are formed by the gain of electrons by 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
Work out the formulae for the following compounds:
Calcium carbonate
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?
