atoms and molecules class 9 mcq

In a chemical substance the elements are always present in fixed proportions by mass. This is known as the : 1) Law of conservation of mass. 2) Law of multiple proportions 3) Law of definite proportions 4) None of these

The total mass of the products formed in a chemical reaction is exactly equal to the mass of the reactants. This is known as 1) Law of conservation of mass 2) Law of multiple proportions 3) Law of definite proportions 4) None of these

Mass of one mole of a substance is called 1) Atomic mass 2) Molecular mass 3) Molar mass 4) Unit mass

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atoms and molecules class 9 mcq

An ………. is the smallest particle of an element that can participate in chemical reaction and retain all its properties. 1. Molecule 2) Compound 3) Atom 4) Mixture

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In a chemical substance the elements are always present in fixed proportions by mass. This is known as the : 1) Law of conservation of mass. 2) Law of multiple proportions 3) Law of definite proportions 4) None of these

Answers in Last Page >>>

The total mass of the products formed in a chemical reaction is exactly equal to the mass of the reactants. This is known as 1) Law of conservation of mass 2) Law of multiple proportions 3) Law of definite proportions 4) None of these

Answers in Last Page >>>

Mass of one mole of a substance is called 1) Atomic mass 2) Molecular mass 3) Molar mass 4) Unit mass

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