CBSE Class 11 Chemistry Structure Of Atom Worksheet Set 03

Structure Of Atom MCQ Questions with Answers Class 11 Chemistry

Question- The correct order of increasing energy of atomic orbitals is

(a) 5 p < 4 f < 6 s < 5 d

(b) 5 p < 6 s < 4 f < 5 d

(c) 5 p < 5 d < 4 f < 6 s

(d) None of these

Answer-(b)

Question- The number of orbitals present in the fifth shell will be

(a) 25

(b) 10

(c) 50

(d) 20

Answer-(a)

Question-The total number of electrons that can be accommodated in all orbitals having principal quantum number 2 and azimuthal quantum number 1 is

(a) 2

(b) 4

(c) 6

(d) 8

Answer-(c)

Question-The order of filling of electrons in the orbitals of an atom will be

(a) 3d, 4s, 4p, 4d, 5s

(b) 4s, 3d, 4p, 5s, 4d

(c) 5s, 4p, 3d, 4d, 5s

(d) 3d, 4p, 4s, 4d, 5s

Answer-(b)

Question- The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?

(a) 1

(b) 3

(c) 2

(d) 4

Answer-(a)

Question- Number of unpaired electrons in N²⁺ is

(a) 2

(b) 0

(c) 1

(d) 3

Answer-(c)

Question-Which of the following is not permissible arrangement of electrons in an atom?

(a) n = 5, l = 3, m = 0, s = + 1/2

(b) n = 3, l = 2, m = – 3, s = – 1/2

(c) n = 3, l = 2, m = – 2, s = – 1/2

(d) n = 4, l = 0, m = 0, s = – 1/2

Answer-(b)

Question-An ion has 18 electrons in the outermost shell, it is

(a) Cu⁺

(b) Th⁴⁺

(c) Cs⁺

(d) K⁺

Answer-(a)

Question-Which of the following sets of quantum numbers represents the highest energy of an atom?

(a) n = 3, l = 0, m = 0, s = +1/2

(b) n = 3, l = 1, m = 1, s = +1/2

(c) n = 3, l = 2, m = 1, s = +1/2

(d) n = 4, l = 0, m = 0, s = +1/2

Answer-(c)

Question-Which of the following represents correct set of the four quantum numbers for an electron in a 4d subshell ?

(a) 4, 2, 1, 0

(b) 4, 2, 1, – 1/2

(c) 4, 3, 2, + 1/2

(d) 4, 3, – 2, – 1/2

Answer-(b)

Question-What will be the sum of all possible values of l and m for n = 5 ?

(a) 12

(b) 13

(c) 4

(d) 9

Answer-(b)

Question-The orbitals are called degenerate when

(a) they have the same wave functions

(b) they have the same wave functions but different energies

(c) they have different wave functions but same energy

(d) they have the same energy

Answer-(d)

Question- The number of spherical nodes in 3p orbitals are

(a) one

(b) three

(c) two

(d) None of these

Answer-(a)

Question-If there are five radial nodes, then what can be the correct representation of the orbital for n = 8.

(a) 8d

(b) 8s

(c) 8p

(d) 8f

Answer-(a)

Question-What is the correct orbital designation of an electron with the quantum number, n = 4, l = 3, m = – 2, s = 1/2 ?

(a) 3s

(b) 4 f

(c) 5p

(d) 6s

Answer-(b)

Question-For azimuthal quantum number l = 3, the maximum number of electrons will be

(a) 2

(b) 6

(c) 0

(d) 14

Answer-(d)

Question-What can be the representation of the orbital having 3 angular nodes and n = 5.

(a) 5d

(b) 5f

(c) 5p

(d) 5s

Answer-(b)

Question-Arrange the orbital of same shell in the increasing order of shielding strength of the outer shell of electrons. s, f, d, p

(a) s < p < d < f

(b) s > p < d < f

(c) s > p > d < f

(d) s > p > d > f

Answer-(d)

Question-The number of d-electrons retained in Fe²⁺ (At. no. of Fe = 26) ion is

(a) 4

(b) 5

(c) 6

(d) 3

Answer-(c)

Question-In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

(a) Hund’s Rule

(b) Aufbau principle

(c) Uncertainty principle

(d) Pauli’s exclusion principle

Answer-(d)

Question- Maximum number of electrons in a subshell of an atom is determined by the following:

(a) 2 l + 1

(b) 4 l – 2

(c) 2 n2

(d) 4 l + 2

Answer-(d)

Instructions:

1. All questions are compulsory.

2. Please give the explanation for the answer where applicable.

Q1 - The uncertainty in momentum of an electron is 1.0 x 10^-5 Kg ms^-1 . What is the uncertainty in its position? 

Q2 - Find the de Broglie wavelength in Å of a particle with mass 1g and velocity 100m/s. 

Q3 - Find wavelength of photon having energy 3.03 x 10^-19 J. 

Q4 - What will be the uncertainty in velocity of an electron (mass of electron = 9.1 x 10^-28 g) moving with a velocity of 3.0 x 10⁴ ms^-1 accurate up to 0.011%?

Q5 -Write the electronic configuration of following atoms/ions - F –, Cr, Mg²⁺, O^–, Ca

(Atomic number of F = 9, Cr = 24, Mg = 12 ,O = 8, Ca = 20) (5 Marks)

Q6 - Which of the following species are isoelectronic? N^a+, O^2-, F^-, Ca²⁺, K⁺ 

Q7 - (i) Write values of n and l for 4f orbital.

(ii) Write all possible values of l and m for n = 2.

Q8 - Write one isobar of 

Q9 - Which series of lines of the hydrogen spectrum lie in the visible region? 

Q10 - What do you mean that energy of the electron is quantized? 

Please refer to the link below for CBSE Class 11 Chemistry Structure Of Atom Worksheet Set C