Assertion and Reason Atoms and Molecules Part 3

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Q (1): Assertion: Relative atomic mass of the atom of element is the average masses of the atom as compared to the mass of one carbon-12 atom.

Reason: Carbon-12 isotope is the standard reference for measuring atomic masses.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (2): Assertion: Water molecules always contain hydrogen and oxygen in the ratio 1:8.

Reason: Water obeys law of constant proportions irrespective of source and method of preparation.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (3): Assertion : Protons cannot be transferred from one atom to another.

Reason : Protons are present deep inside the atom in its nucleus.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (4): Assertion : A molecule is the smallest particle of an element or a compound which is capable of free existence.

Reason : The number of atoms present in one molecule of the substance is called its atomicity.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (5): Assertion : Molecular weight of oxygen is 16.

Reason : Atomic weight of oxygen is 16.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (6): Assertion : On burning magnesium in oxygen, the mass of magnesium oxide formed is equal to the total mass of magnesium and oxygen

Reason : In a chemical substance, the elements are always present in a definite proportion.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (7): Assertion: Atomicity of ozone is three while that of oxygen is two.

Reason: Atomicity is the number of atoms constituting a molecule.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (8): Assertion: Atoms always combine to form molecule and ions.

Reason: Atoms of most element are not able to exist independently.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (9): Assertion : Oxygen molecule is known as diatomic molecule.

Reason : Oxygen is always takes part in chemical reaction.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (10): Assertion : Oxygen molecule is known as diatomic molecule.

Reason : Oxygen is always taking part for making molecule.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (11): Assertion : Oxygen molecule is known as diatomic molecule.

Reason : Two Oxygen atoms get combine and for molecule hence it called diatomic molecule.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (12): Assertion : Sodium chloride molecule is made up of two different ions.

Reason : Sodium chloride is usually used for making food.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (13): Assertion : Sodium chloride molecule is made up of two different ions.

Reason : Sodium chloride is known as baking soda.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (14): Assertion : The combining power of an element is known as its valency.

Reason : Valency can be used to find out how the atoms of an element will combine with the atoms of another element to form chemical compound

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (15): Assertion : The valencies or charges on the ion must balance in every compound.

Reason : Valencies are always found on top of the compound.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (16): Assertion : Formula of the hydrogen chloride is HCl.

Reason : Valency of the HCl is 2,1

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (17): Assertion : Atom is the smallest unit of molecule

Reason : It is not seen by our naked eyes.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (18): Assertion : In a water compound ration of mass of hydrogen to oxygen is always 1:8.

Reason : Standard weight of Oxygen molecule is 1 gram.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (19): Assertion : In a water compound ration of mass of hydrogen to oxygen is always 1:8.

Reason : In the water molecule Oxygen and Hydrogen is always present in definite proportions by mass that is the reason it is become stable molecule.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

Q (20): Assertion : Atoms are always taking part in chemical reaction.

Reason : Atoms are tiny particle of molecule hence every chemical reaction happens by those tiny particles called atom.

1 point

( a) Both A and R are true and R is the correct explanation of A.

( b) Both A and R are true but R is not the correct explanation of A.

( c) A is true but R is false.

( d) A is false but R is true.

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