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Question
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”
Which of the following laws is not related to this statement?
(i) Law of conservation of mass
(ii) Law of definite proportions
(iii) Law of multiple proportions
(iv) Avogadro law
Solution
(i) Law of conservation of mass
(iv) Avogadro law
Explanation:
Law of conservation of mass: The mass is neither created nor destroyed during a chemical reaction in an isolated system. Ti can only be destroyed during a chemical reaction in an isolated system. It can only be transformed from one form to another. Burning of wood is an example of conservation of mass.
Law of definite proportion: A compound contains exactly the same elements in the fixed proportion by mass. For example, pure water consists of 11.196 H and 88.9% by mass.
Law of multiple proportion: When two elements react to form two or more than two chemical compounds, the ratio between different masses of one of the elements combining with a fixed mass of the other is always in the ratio of tiny numbers. For example, compounds of carbon and oxygen.
Avogadro's law: This law states that the number of moles of a gas is directly related to the volume enclosed by the gas at constant pressure and temperature.
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RELATED QUESTIONS
The following data are obtained when dinitrogen and dioxygen react together to form different compounds:-
| Mass of dinitrogen | Mass of dioxygen | |
| (i) | 14 g | 16 g |
| (ii) | 14 g | 32 g |
| (iii) | 28 g | 32 g |
| (iv) | 28 g | 80 g |
(a) Which law of chemical combination is obeyed by the above experimental data?Give its statement.
(b) Fill in the blanks in the following conversions:
(i) 1 km = ______ mm = ______ pm
(ii) 1 mg = ______ kg = ______ ng
(iii) 1 mL = ______ L = _______ dm3
Which of the following statements indicates that law of multiple proportion is being followed?
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
Is this statement true?
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
If yes, according to which law?
If two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in whole number ratio.
Give one example related to this law.
Define the law of multiple proportions. Explain it with two examples. How does this law point to the existence of atoms?
A box contains some identical red coloured balls, labelled as A, each weighing 2 grams. Another box contains identical blue coloured balls, labelled as B, each weighing 5 grams. Consider the combinations AB, AB2, A2B and A2B3 and show that law of multiple proportions is applicable.
What is a combination reaction?
Which one of the following pairs of compounds illustrates the law of multiple proportion?
