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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
The law of constant proportions was given by :
In water, the proportion of oxygen and hydrogen by mass is :
When 5 g of calcium is burnt in 2 g of oxygen, then 7 g of calcium oxide is produced. What mass of calcium oxide will be produced when 5 g of calcium is burnt in 20 g of oxygen ? Which law of chemical combination will govern your answer ?
What do we call those particles which have more or less electrons than the normal atoms ?
What do we call those particles which have more electrons than the normal atoms ?
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:
Calcium carbonate
State the law of constant proportions.
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?
