Question:

The statements for laws of chemical combinations are given below. Mark the option which is not correctly matched.

Updated On: Aug 1, 2022
  • Matter can neither be created nor destroyed: Law of conservation of mass
  • A compound always contains exactly the same proportion of elements by weight: Law of definite proportions
  • When gases combine they do so in a simple ratio by weight: Gay Lussac s Law
  • Equal volumes of gases at same temperature and pressure contain same number of molecules: Avogadro?? Law
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The Correct Option is C

Solution and Explanation

Law of Conservation of Mass states that matter can neither be created nor destroyed. The total mass, that is, the sum of the mass of the reacting mixture and the products formed remains constant. Law of Definite Proportions states that the proportion of elements by weight in a given compound will always remain exactly the same. Gay Lussac's Law of Gaseous Volume states that in a gaseous system, when the reactants combine together they always do so in volumes which bear a simple ratio to one another and to the volume of the products, under similar conditions of temperature and pressure. Avogadro's Law states that under the same conditions of temperature and pressure, the equal volume of all the gases contains an equal number of molecules. Thus statement C is for Law of definite proportion
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Concepts Used:

Laws of Chemical Combination

Basic Laws of Chemical Combinations:

The five basic laws of chemical combination for elements and compounds are given below.

Law of Conservation of Mass:

The Law of conservation of mass or the principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so the quantity can neither be added nor be removed.

Law of Definite Proportions:

The Law of definite proportions, sometimes called Proust's law, or the law of constant composition states that a given chemical compound always contains its component elements in a fixed ratio and does not depend on its source and method of preparation

Law of Multiple proportions:

The Law of multiple proportions states that if two elements form more than one compound, then the ratios of the masses of the second element which combine with a fixed mass of the first element will always be ratios of small whole numbers.

Gay Lussac’s Law of Gaseous Volumes:

Gay Lusaacc's law of gaseous volume states that the pressure of a given mass of gas varies directly with the absolute temperature when the volume is kept constant.

Avogadro’s Law:

Avogadro-Ampère's hypothesis is an experimental gas law relating the volume of a gas to the amount of substance of gas present.