Assertion and Reason Structure of Atom Part 2

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Q (1): Assertion: Valency of fluorine is one.

Reason: Fluorine atom contain seven valence electrons.

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 : The size of the nucleus is very small as compared to the size of the atom.

Reason : The electrons revolve around the nucleus of the 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 (3): Assertion : Thomson’s atomic model is known as ‘raisin pudding’ model.

Reason : The atom is visualized as a pudding of positive charge with electrons (raisins) embedded in it.

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 : Electrons moving in the same orbit will lose or gain energy.

Reason : On jumping from higher to lower energy level, the electron will gain energy.

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 : A few positively charged a -particles are deflected in Rutherford’s experiment.

Reason : Most of the space in the atom is empty

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 : Isotopes are electrically neutral.

Reason : Isotopes are species with same mass number but different atomic numbers

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 : Isotopes are electrically neutral.

Reason : Isotopes of an element have equal number of protons and electrons

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 : In Rutherford’s gold foil experiment, very few a -particles are deflected back.

Reason : Nucleus present inside the atom is heavy

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 : Isobars are identical in chemical properties.

Reason : Isobars have same mass number.

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 : Anions are larger in size than the parent atom.

Reason : In an anion, the number of protons in the nucleus is less than the number of electrons moving around it.

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 : Isotopes of an element show different valencies .

Reason : Isotopes have different atomic numbers

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 : The atoms of different elements having same mass number but different atomic numbers are known as isobars.

Reason : The sum of protons and neutrons, in the isobars is always different.

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 : For noble gases, valency is zero.

Reason : Noble gases have 8 valence electrons.

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 mass of the total number of proton sand neutrons is a measure of the approximate mass of an atom.

Reason : The mass of an electron is negligible.

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 : Bohr’s orbits are called stationary orbits.

Reason : Electrons remain stationary in these orbits for some time.

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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