Structure of Atom Test

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Structure of Atom Test - 13

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Question 1
1 / -0

Orbital angular momentum depends on..........

A
l

B
n and l

C
n and m

D
m and s

Solution

‘l’ also known as orbital angular momentum or subsidiary quantum number. It defines the three dimensional shape of the orbital. For a given value of n, l can have n values ranging from 0 to n - 1, that is, for a given value of n, the possible values of l are:

l = -0,1,2 …….. (n - 1).
Question 2
1 / -0

In which of the following pairs, the ions are iso-electronic?

(i) \(Na ^+ , Mg ^{2+}\)

(ii) \(Al ^{3+} , O ^-\)

(iii) \(Na ^+ , O ^{2-}\)

(iv) \(N ^{3-} , Cl^-\)

A
(i),(iii)

B
(i),(iv)

C
(ii),(iii)

D
(iii),(iv)

Solution

Atoms or ions having same number of electrons is known as isoelectronic species.

Question 3

1 / -0

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

	Column I		Column II
(i)	Photon	(a)	Value is 4 for N shell
(ii)	Electron	(b)	Probability density
(iii)	\(\psi^2\)	(c)	Always positive value
(iv)	Principal quantum number n	(d)	Exhibits both momentum and wavelength

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

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

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

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

Question 4
1 / -0

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): It is impossible to determine the exact position and exact momentum of an electron simultaneously.

Reason (R): The path of an electron in an atom is clearly defined.

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

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

C
A is true and R is false

D
Both A and R are false

Solution

The effect of Heisenberg Uncertainty Principal is significant only for motion of microscopic objects and is negligible for that of macroscopic objects.
Question 5
1 / -0

Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately

A
1:2

B
1:1

C
1:3

D
3:1

Solution

Ordinary chlorine is a mixture of two isotopes with atomic masses 37U and 35U and they are present in ratio 1:3

Hence, average atomic mass = \(35\times 3+37\times 1\over 3+1\) = 35.5u
Question 6
1 / -0

The pair of ions having same electronic configuration is.......

A
\(Cr^{3+}, Fe^{3+}\)

B
\(Fe^{3+}, Mn^{2+}\)

C
\(Fe^{3+}, Co^{3+}\)

D
\(Sc^{3+}, Cr^{3+}\)

Solution

Fe(Z = 26) and Mn(Z = 25)

\(Fe^{3+}\) and \(Mn^{2+}\) will have same no. of electrons and hence, the same electronic configuration.
Question 7
1 / -0

Which of the following statements concerning the quantum numbers are correct?

(i) Angular quantum number determines the three-dimensional shape of the orbital.

(ii) The principal quantum number determines the orientation and energy of the orbital.

(iii) Magnetic quantum number determines the size of the orbital.

(iv) Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.

A
(i),(iv)

B
(iii),(iv)

C
(ii),(iii)

D
(i),(ii)

Solution

Principal quantum number (n): It identifies shell, determines sizes and energy.

Azimuthal quantum number (l): Azimuthal quantum number ‘l’ is also known as orbital angular momentum or subsidiary quantum number. It identifies sub-shell, determines the shape of orbitals, energy of orbitals in multi-electron atoms along with principal quantum number and orbital angular momentum.

Magnetic quantum number or Magnetic orbital quantum number(\(m_l\)): It gives information about the spatial orientation of the orbital with respect to standard set of coordinate axis.

Electron spin quantum number (\(m_s\)): It refers to orientation of the spin of the electron. It can have two values, +1/2 and -1/2 . +1/2 identifies the clockwise spin and -1/2 identifies the anti-clockwise spin.
Question 8
1 / -0

For the electrons of oxygen atom, which of the following statements is correct?

A
\(Z_{eff}\) for an electron in a 2s orbital is the same as \(Z_{eff}\) for an electron in a 2p orbital

B
An electron in the 2s orbital has the same energy as an electron in the 2p orbital

C
\(Z_{eff}\) for an electron in 1s orbital is the same as \(Z_{eff}\) for an electron in a 2s orbital

D
The two electrons present in the 2s orbital have spin quantum numbers \(m_s\) but of opposite sign

Solution

Pauli Exclusion Principle: Only two electrons may exist in the same orbital and these electrons must have opposite spin.

Question 9

1 / -0

Match species given in Column I with the electronic configuration given in Column II.

	Column I		Column II
(i)	\(Cr\)	(a)	\([Ar]3d^84s^0\)
(ii)	\(Fe^{2+}\)	(b)	\([Ar]3d^{10}4s^1\)
(iii)	\(Ni^{2+}\)	(c)	\([Ar]3d^64s^0\)
(iv)	\(Cu\)	(d)	\([Ar]3d^54s^1\)
		(e)	\([Ar]3d^64s^2\)

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

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

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

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

Question 10
1 / -0

If travelling at same speeds, which of the following matter waves have the shortest wavelength?

A
Electron

B
Alpha particle \((He ^{2+} )\)

C
Neutron

D
Proton

Solution

\(\lambda={h\over mv}={h\over p}\)

Higher the mass, shortest is the wavelength. Since alpha particles have the highest mass, they have shortest wavelength.

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Structure of Atom Test - 13

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Structure of Atom Test - 13

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Question 1

l

n and l

n and m

m and s

Solution

Question 2

(i),(iii)

(i),(iv)

(ii),(iii)

(iii),(iv)

Solution

Question 3

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

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

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

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

Question 4

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

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

A is true and R is false

Both A and R are false

Solution

Question 5

1:2

1:1

1:3

3:1

Solution

Question 6

\(Cr^{3+}, Fe^{3+}\)

\(Fe^{3+}, Mn^{2+}\)

\(Fe^{3+}, Co^{3+}\)

\(Sc^{3+}, Cr^{3+}\)

Solution

Question 7

(i),(iv)

(iii),(iv)

(ii),(iii)

(i),(ii)

Solution

Question 8

\(Z_{eff}\) for an electron in a 2s orbital is the same as \(Z_{eff}\) for an electron in a 2p orbital

An electron in the 2s orbital has the same energy as an electron in the 2p orbital

\(Z_{eff}\) for an electron in 1s orbital is the same as \(Z_{eff}\) for an electron in a 2s orbital

The two electrons present in the 2s orbital have spin quantum numbers \(m_s\) but of opposite sign

Solution

Question 9

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

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

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

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

Question 10

Electron

Alpha particle \((He ^{2+} )\)

Neutron

Proton

Solution

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