MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers

Structure of Atom Class 11 Chemistry MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 11 Chemistry Chapter 2 Structure of Atom with Answers Pdf free download. MCQ Questions for Class 11 Chemistry with Answers were prepared based on the latest exam pattern. We have Provided Structure of Atom Class 11 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Class 11 Chemistry Chapter 2 Quiz

Class 11 Chemistry Chapter 2 MCQ Online Test

You can refer to NCERT Solutions for Class 11 Chemistry Chapter 2 Structure of Atom to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Structure of Atom Class 11 Chemistry MCQ online test

Q1.	Which of the following pair of ions have same paramagnetic moment?
	A.Cu⁺², Ti⁺³
	B.Mn⁺², Cu⁺²
	C.Ti⁺⁴, Cu⁺²
	D.Ti⁺³, Ni⁺²

Ans: Cu⁺², Ti⁺³

Q2.	The charge to mass ratio of α – particles is approximately …… the charge to mass ratio of protons
	A.Twice
	B.Half
	C.Four times
	D.Six times

Ans: Half

Q3.	The frequency of a wave of light is 12 × 10¹⁴s^-1. The wave number associated with this light
	A.5 × 10^-7m
	B.4 × 10^-8cm^-1
	C.2 × 10^-7m^-1
	D.4 × 10⁴cm^-1

Ans: 4 × 10⁴cm^-1

Q4.	In a multi – electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic acid and electric fields? (a) n = 1, l = 0, m = 0 (b) n = 2, l = 0, m = 0 (c) n = 2, l = 1, m = 1 (d) n = 3, l = 2, m = 1 (e) n = 3, l = 2, m = 0
	A.(a) and (b)
	B.(b) and (c)
	C.(c) and (d)
	D.(d) and (e)

Ans: (d) and (e)

Q5.	The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state)
	A.Li²⁺
	B.He⁺
	C.H
	D.H⁺

Ans: Li²⁺

Q6.	In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is
	A.1.51 eV
	B.3.4 eV
	C.6.04 eV
	D.13.6 eV

Ans: 1.51 eV

Q7.	The credit of discovering neutron goes to
	A.Rutherford
	B.Thomson
	C.Goldstein
	D.Chadwick

Ans: Chadwick

Q8.	The maximum number of electrons that can be accommodated in fifth energy level is
	A.10
	B.25
	C.50
	D.32

Ans: 50

Q9.	According to Aufbaus principle, which of the three 4d, 5p and 5s will be filled with electrons first
	A.4d
	B.5p
	C.5s
	D.4d and 5s will be filled simultaneously

Ans: 5s

Q10.	A hydrogen atom in its ground state absorbs 10.2 eV of energy. The orbital angular momentum is increased by (Given Planck constant h = 6.6 × 10^-34 Jsec)
	A.1.05 × 10^-34 Jsec
	B.3.16 × 10^-34 Jsec
	C.2.11 × 10^-34 Jsec
	D.4.22 × 10^-34 Jsec

Ans: 1.05 × 10^-34 Jsec

Q11.	The ionization enthalpy of hydrogen atom is 1.312 × 10⁶ J mol^-1. The energy required to excite the electron in the atom from n = 1 to n = 2 is
	A.8.51 × 10⁵ Jmol^-1
	B.6.56 × 10⁵ Jmol^-1
	C.7.56 × 10⁵ Jmol^-1
	D.9.84 × 10⁵ Jmol^-1/sup>

Ans: 9.84 × 10⁵J mol^-1

Q12.	For principal quantum number n = 4, the total number of orbitals having l = 3 is
	A.3
	B.7
	C.5
	D.9

Ans: 7

Q13.	Maximum number of electrons in a subshell with l = 3 and n = 4 is
	A.10
	B.12
	C.14
	D.16

Ans: 14

Q14.	Which hydrogen-like species will have same radius as that of Bohr orbit of hydrogen atom?
	A.n = 2, Li²⁺
	B.n = 2, Be³⁺
	C.n = 2, He⁺
	D.n = 3, Li²⁺

Ans: n = 2, Be³⁺

Q15.	The magnetic quantum number specifies
	A.Size of orbitals
	B.Shape of orbitals
	C.Orientation of orbitals
	D.Nuclear Stability

Ans: Orientation of orbitals

Q16.	In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?
	A.3 → 2
	B.5 → 2
	C.4 → 1
	D.2 → 5

Ans: 5 → 2

Q17.	In chromium atom, in ground state, the number of occupied orbitals is
	A.14
	B.15
	C.7
	D.12

Ans: 15

Q18.	A sub-shell with n = 6 , l = 2 can accommodate a maximum of
	A.12 electrons
	B.36 electrons
	C.10 electrons
	D.72 electrons

Ans: 10 electrons

Q19.	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

Ans: n = 3, l = 2, m = 1, s = + 1/2

Q20.	The value of Plancks constant is 6.63 × 10^-34Js. The velocity of light is 3.0 × 10⁸ms^-1. Which value is closest to the wavelength in nanometres of a quantum of light with frequency of 8 × 10¹⁵s^-1
	A.3 × 10⁷
	B.2 × 10^-25
	C.5 × 10^-18
	D.4 × 10¹