Test: Laws Of Chemical Combination - Class 9 MCQ

Law of constant proportion

Law of conservation of mass

Law of conservation of mass and Law of constant proportion

Law of multiple proportion

Atoms of a given element have same mass and chemical properties.

Matter is made of tiny particles.

Atom can neither be created nor destroyed.

The relative number and kind of atoms are constant in a given compound.

15 g

5 g

50 g

10 g

Catalysts

Products

Apparatus used for reaction

Gases evolved

Precipitation reaction

Double displacement reaction

Neutralization reaction

Both A and B

Law of conservation of mass

Laws of Chemical combination

Law of constant proportions

Dalton’s Atomic theory

The difference in the products’ masses is equal to the mass of the CaCO₃.

The mass of each product is equal to the mass of the CaCO₃.

The sum of the products’ masses equals the mass of the CaCO₃.

The sum of the products’ masses is less than the mass of the CaCO₃.

136.3 u

124 u

123 u

111 u

In a chemical reaction, efforts should be made to preserve rare elements without changing them.

In a chemical reaction, the final mass of the products is always greater than the starting mass of the reactants.

In a chemical reaction, matter is not created or destroyed, but is conserved.

Matter can be created and destroyed but does not change forms.

If two elements form more than one compound between them, then the ratios of the masses of the second element which combine with a fixed mass of the first element will be ratios of small whole numbers.

The elements are always present in a constant proportion in a chemical substance.

The rate of reaction is directly proportional to the active mass of the reactants.

In a chemical reaction, matter is not created or destroyed, but is conserved.

Cavendish

Proust

Dalton

Lavoisier

All matter is made up of very tiny particles called atoms.

Atoms can be divided into proton, neutron and electrons.

Atoms of given element are identical in mass and chemical properties.

Atoms combine in the ratio of small whole numbers to form compounds.

Atoms of an element have exactly the same mass.

All of the these

Atoms of different elements have same masses.

Atoms are indivisible.

Mass can neither be created nor destroyed.

The rate of reaction is directly proportional to the active mass of the reactants.

Mass can either be created or destroyed in a chemical reaction.

The elements are always present in a constant proportion in a chemical substance

Law of conservation of mass

Law of multiple proportions

Law of definite proportion

Law of combining volumes

The number of atoms in a given compound is fixed.

Atoms of the same elements cannot combine in more than one ratio to form more than one compound.

Atoms can neither be created nor destroyed.

Atoms cannot be divided.

Displacement reaction

Precipitation reaction

Double decomposition reaction

Decomposition reaction

4g oxygen and 16g hydrogen

2g hydrogen and 1g oxygen

8g oxygen and 1g hydrogen

none

Thomson

Lavoisier

Dalton

Cavendish

The reactants must contain more complex molecules than the products do.

The products must have different physical state than the reactants.

The total mass of the reactants must equal the total mass of the products.

The density of the reactants must equal the density of the products.