All samples of pure water contain hydrogen and oxygen in the mass ratio of $1 : 8$ . To which of the following laws does the above statements is in agreement?

Law of conservation of mass

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Law of constant proportion

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Law of multiple proportion

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Law of definite proportion

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Solution

The correct option is B Law of constant proportion
Law of constant proportions: According to this law, a chemical compound always contains the same proportion of elements by mass. Thus, irrespective of the source, or chemical compound always contains the element in a fixed ratio by mass.

For example, pure water obtained from river, sea, well etc always contains hydrogen and oxygen combined together in the ratio of $1 : 8$ by mass.

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Q. Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8 by mass. This proves the law of:

Question 22

One of the statements of Dalton's atomic theory is given below "Compounds are formed when atoms of different elements combine in a fixed ratio"

(a) Law of conservation of mass (b) Law of definite proportions

In NO, N₂O and NO₂, the masses of nitrogen which combine with a fixed mass of oxygen bear a simple ratio of 2: 4: 1. This is in accordance with which law?

Which of the following statements indicates that law of multiple proportion is being followed ?

(a) Sample of carbon dioxide taken from any source will always have carbon and oxygen in the ratio 1 : 2

(b) Carbon forms two oxides namely $C O_{2}$ and CO, where masses of oxygen which combine with fixed mass of carbon are in the simple ratio 2 : 1

(c) When magnesium burns in oxygen, the amount of magnesium taken for the reactoin is equal to the amount of magnesium in magnesium oxide formed

(d) At constant temperature and pressure 200 mL of hydrogen will combine with 100 mL oxygen to produce 200 mL of water vapour

Q. All samples of carbon dioxide contain carbon and oxygen in the mass ratio of

3 : 8

. This is in agreement with the law of :

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All samples of pure water contain hydrogen and oxygen in the mass ratio of 1:8. To which of the following laws does the above statements is in agreement?

All samples of pure water contain hydrogen and oxygen in the mass ratio of $1 : 8$ . To which of the following laws does the above statements is in agreement?