Structure of Atom Test

Question 1
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Black body is an ideal body that emits and absorbs radiations of all frequencies.

Reason (R): The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

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 explanation of A

C
A is true and R is false

D
Both A and R are false

Question 2
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Identify the pairs which are not of isotopes?

(i) \(^{12}_{6}X,\,^{13}_{6}Y\)

(ii) \(^{35}_{17}X,\,^{37}_{17}Y\)

(iii) \(^{14}_{6}X,\,^{14}_{7}Y\)

(iv) \(^{8}_{4}X,\,^{8}_{5}Y\)

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 3
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Which of the following conclusions could not be derived from Rutherford’s \(\alpha\)-particle scattering experiment?

A
Most of the space in the atom is empty

B
The radius of the atom is about \(10 ^{-10}\)m while that of nucleus is \(10 ^{-15}\) m

C
Electrons move in a circular path of fixed energy called orbits

D
Electrons and the nucleus are held together by electrostatic forces of attraction

Question 4
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Which of the following options does not represent ground state electronic configuration of an atom?

A
\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^8\, 4s^2\)

B
\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^9\, 4s^2\)

C
\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^{10}\, 4s^1\)

D
\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^5\, 4s^1\)

Question 5
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Which of the following statement is not correct about the characteristics of cathode rays?

A
They start from the cathode and move towards the anode

B
They travel in straight line in the absence of an external electrical or magnetic field

C
Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube

D
Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube

Question 6

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Match the following species with their corresponding ground state electronic configuration.

	Atom/Ion		Electronic configuration
(i)	Cu	(a)	\(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}\)
(ii)	\(Cu^{2+}\)	(b)	\(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}4s^2\)
(iii)	\(Zn^{2+}\)	(c)	\(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{10}4s^1\)
(iv)	\(Cr^{3+}\)	(d)	\(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{9}\)
		(e)	\(1s^2\,2s^2\,2p^6\,3s^2\,3p^6\,3d^{3}\)

(i) → (c) (ii) → (d) (iii) → (a) (iv) → (e)

(i) → (c) (ii) → (d) (iii) → (a,b) (iv) → (e)

(i) → (c) (ii) → (d) (iii) → (e) (iv) → (a)

(i) → (a) (ii) → (e) (iii) → (c) (iv) → (d)

Question 7
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Which of the following statements about the electron is incorrect?

A
It is a negatively charged particle

B
The mass of electron is equal to the mass of neutron

C
It is a basic constituent of all atoms

D
It is a constituent of cathode rays

Question 8
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Which of the following properties of atom could be explained correctly by Thomson Model of atom?

A
Overall neutrality of atom

B
Spectra of hydrogen atom

C
Position of electrons, protons and neutrons in atom

D
Stability of atom

Question 9
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Two atoms are said to be isobars if.

A
They have same atomic number but different mass number

B
They have same number of electrons but different number of neutrons

C
They have same number of neutrons but different number of electrons

D
Sum of the number of protons and neutrons is same but the number of protons is different

Question 10

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Match the quantum numbers with the information provided by these.

	Quantum number		Information provided
(i)	Principal quantum number	(a)	orientation of the orbital
(ii)	Azimuthal quantum number	(b)	energy and size of orbital
(iii)	Magnetic quantum number	(c)	spin of electron
(iv)	Spin quantum number	(d)	shape of the orbital

(i) → (b) (ii) → (a) (iii) → (d) (iv) → (c)

(i) → (b) (ii) → (d) (iii) → (a) (iv) → (c)

(i) → (c) (ii) → (d) (iii) → (b) (iv) → (a)

(i) → (b) (ii) → (a) (iii) → (c) (iv) → (d)

Question 11
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Out of the following pairs of electrons, identify the pairs of electrons present in degenerate orbitals:

(i) (a) n= 3, l = 2, \(m_l\) = –2, \(m_s\) = \(-{1\over2}\)

(b) n= 3, l = 2, \(m_l\) = –1, \(m_s\) = \(-{1\over2}\)

(ii) (a) n= 3, l = 1, \(m_l\) = 1, \(m_s\) = \(+{1\over2}\)

(b) n= 3, l = 2, \(m_l\) = 1, \(m_s\) = \(+{1\over2}\)

(iii) (a) n= 4, l = 1, \(m_l\) = 1, \(m_s\) = \(+{1\over2}\)

(b) n= 3, l = 2, \(m_l\) = 1, \(m_s\) = \(+{1\over2}\)

(iv) (a) n= 3, l = 2, \(m_l\) = +2, \(m_s\) = \(-{1\over2}\)

(b) n= 3, l = 2, \(m_l\) = +2, \(m_s\) = \(+{1\over2}\)

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 12
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): All isotopes of a given element show the same type of chemical behaviour.

Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.

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
Both A and R are false

Question 13
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The number of radial nodes for 3p orbital is..............

A
3

B
4

C
2

D
1

Question 14

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Match the following rules with their statements:

	Rules		Statements
(i)	Hund’s Rule	(a)	No two electrons in an atom can have the same set of four quantum numbers.
(ii)	Aufbau Principle	(b)	Half-filled and completely filled orbitals have extra stability.
(iii)	Pauli Exclusion Principle	(c)	Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied.
(iv)	Heisenberg’s Uncertainty Principle	(d)	It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously
		(e)	In the ground state of atoms, orbitals are filled in the order of their increasing energies.

(i) → (d) (ii) → (e) (iii) → (a) (iv) → (b)

(i) → (c) (ii) → (e) (iii) → (d) (iv) → (b)

(i) → (c) (ii) → (e) (iii) → (a) (iv) → (d)

(i) → (c) (ii) → (b) (iii) → (a) (iv) → (d)

Question 15
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Number of angular nodes for 4d orbital is..........

A
4

B
3

C
2

D
1

Question 16
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Which of the following sets of quantum numbers are correct?

n 1 \(m_l\)

(i) 1 1 +2

(ii) 2 1 +1

(iii) 3 2 -2

(iv) 3 4 -2

A
(i),(ii)

B
(ii),(iii)

C
(iii),(iv)

D
(i),(iv)

Question 17
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Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

A
Pauli’s exclusion principle

B
Heisenberg’s uncertainty principle

C
Hund’s rule of maximum multiplicity

D
Aufbau principle

Question 18

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Match the items given in Column I with the items given in Column II:

	Column I		Column II
(i)	X-rays	(a)	\(v=10^0-10^4\) Hz
(ii)	UV	(b)	\(v=10^{10}\) Hz
(iii)	Long radio waves	(c)	\(v=10^{16}\) Hz
(iv)	Microwave	(d)	\(v=10^{18}\) Hz

(i) → (b) (ii) → (c) (iii) → (a) (iv) → (d)

(i) → (d) (ii) → (c) (iii) → (b) (iv) → (a)

(i) → (d) (ii) → (c) (iii) → (a) (iv) → (b)

Question 19
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Total number of orbitals associated with third shell will be

A
2

B
4

C
9

D
3

Submit Test

Structure of At...

Question 1

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the explanation of A

A is true and R is false

Both A and R are false

Question 2

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 3

Most of the space in the atom is empty

The radius of the atom is about \(10 ^{-10}\)m while that of nucleus is \(10 ^{-15}\) m

Electrons move in a circular path of fixed energy called orbits

Electrons and the nucleus are held together by electrostatic forces of attraction

Question 4

\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^8\, 4s^2\)

\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^9\, 4s^2\)

\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^{10}\, 4s^1\)

\(1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^6\, 3d^5\, 4s^1\)

Question 5

They start from the cathode and move towards the anode

They travel in straight line in the absence of an external electrical or magnetic field

Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube

Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube

Question 6

(i) → (c) (ii) → (d) (iii) → (a) (iv) → (e)

(i) → (c) (ii) → (d) (iii) → (a,b) (iv) → (e)

(i) → (c) (ii) → (d) (iii) → (e) (iv) → (a)

(i) → (a) (ii) → (e) (iii) → (c) (iv) → (d)

Question 7

It is a negatively charged particle

The mass of electron is equal to the mass of neutron

It is a basic constituent of all atoms

It is a constituent of cathode rays

Question 8

Overall neutrality of atom

Spectra of hydrogen atom

Position of electrons, protons and neutrons in atom

Stability of atom

Question 9

They have same atomic number but different mass number

They have same number of electrons but different number of neutrons

They have same number of neutrons but different number of electrons

Sum of the number of protons and neutrons is same but the number of protons is different

Question 10

(i) → (b) (ii) → (a) (iii) → (d) (iv) → (c)

(i) → (b) (ii) → (d) (iii) → (a) (iv) → (c)

(i) → (c) (ii) → (d) (iii) → (b) (iv) → (a)

(i) → (b) (ii) → (a) (iii) → (c) (iv) → (d)

Question 11

(i),(ii)

(ii),(iii)

(iii),(iv)

(i),(iv)

Question 12

Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

Both A and R are false

Question 13

3

4

2

1

Question 14

(i) → (d) (ii) → (e) (iii) → (a) (iv) → (b)

(i) → (c) (ii) → (e) (iii) → (d) (iv) → (b)

(i) → (c) (ii) → (e) (iii) → (a) (iv) → (d)

(i) → (c) (ii) → (b) (iii) → (a) (iv) → (d)

Question 15

4

3

2

1

Question 16

(i),(ii)

(ii),(iii)

(iii),(iv)