Assertion and Reason Atoms and Molecules Part 1

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Q (1): 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 (2): Assertion: Atoms can neither be sub-divided, created nor destroyed.

Reason: This postulate of Dalton's theory is the result of law of constant 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 (3): Assertion: Carbonates are polyatomic ions.

Reason: The carbonate ion consists of one carbon atom and three oxygen atoms and carries an overall charge of 2-.

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: Relative atomic mass of the atom of element is the average masses of the atom as compared to 1/12 th 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 (5): 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 (6): 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 (7): 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 (8):

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 : 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 (10): Assertion : The valency of aluminium is 3 and oxygen is 2.

Reason : The chemical formula of aluminium oxide is Al3O2.

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.

Q11

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 : 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 (13): 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 (14): Assertion : A sodium ion has positive charge.

Reason : Sodium ion has more protons than a neutral 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.

Q (15): Assertion : In water, the ratio of mass of hydrogen to the mass of oxygen is always 1 : 8 whatever the source of water.

Reason : According to law of constant proportion, the elements are always present in definite proportion by mass in a chemical substance

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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