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

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 11 Chemistry book Chapter 2 Structure of Atom with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 11 Chemistry Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Structure of Atom. Each Questions has four options followed by the right answer. Download the Chemistry Quiz Questions with Answers for Class 11 free Pdf and prepare to exam and help students understand the concept very well.

MCQ Questions for Class 11 Chemistry with Answers

Q1. The charge to mass ratio of α – particles is approximately …… the charge to mass ratio of protons

(i) Twice
(ii) Half
(iii) Four times
(iv) Six times

(ii) Half

Q2. The number of nodal planes in px orbital is

(i) one
(ii) two
(iii) three.
(iv) zero

(i) one

Q3. A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

(i) 518 nm
(ii) 1035 nm
(iii) 325 nm
(iv) 743 nm

(iv) 743 nm

Q4. Which of the following is never true for cathode rays ?

(i) They are electromagnetic waves.
(ii) They produce heat.
(iii) They produce mechanical pressure
(iv) They possess kinetic energy.

(i) They are electromagnetic waves.

Q5. In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is

(i) 1.51 eV
(ii) 3.4 eV
(iii) 6.04 eV
(iv) 13.6 eV

(i) 1.51 eV

Q6. Azimuthal quantum number determines the

(i) size
(ii) spin
(iii) orientation
(iv) angular momentum of orbitals

(iv) angular momentum of orbitals

Q7. The magnetic quantum number specifies

(i) Size of orbitals
(ii) Shape of orbitals
(iii) Orientation of orbitals
(iv) Nuclear Stability

(iii) Orientation of orbitals

Q8. Which of the following statements about the electron is incorrect?

(i) The mass of electron is equal to the mass of neutron
(ii) It is a basic constituent of all atoms.
(iii) It is a constituent of cathode rays.
(iv) It is negatively charged particle

(i) The mass of electron is equal to the mass of neutron

Q9. The credit of discovering neutron goes to

(i) Rutherford
(ii) Thomson
(iii) Goldstein
(iv) Chadwick

(iv) Chadwick

Q10. The total number of orbitals in a shell having principal quantum n is

(i) 2n
(ii) n²
(iii) 2n²
(iv) (n + 1)

(ii) n²

Q11. Which of the following element has least number of electrons in its M-shell?

(i) K
(ii) Mn
(iii) Ni
(iv) Sc

(i) K

Q12. Which is not true with respect to cathode rays?

(i) Move with speed same as that of light
(ii) Can be deflected by magnetic fields
(iii) Charged particles
(iv) A stream of electrons

(i) Move with speed same as that of light

Q13. According to Aufbaus principle, which of the three 4d, 5p and 5s will be filled with electrons first

(i) 4d
(ii) 5p
(iii) 5s
(iv) 4d and 5s will be filled simultaneously

(iii) 5s

Q14. The line spectrum of hydrogen obtained in the visible region of light corresponds to

(i) Lyman series
(ii) Balmer series
(iii) Paschen series
(iv) Brackett series

(ii) Balmer series

Q15. In the ground state, an element has 13 electrons in its M-shell. The element is_____.

(i) Copper
(ii) Chromium
(iii) Nickel
(iv) Iron

(ii) Chromium

Q16. In discharge tube experiment stream of negatively charged particles travel from

(i) cathode to anode
(ii) Electrons does not travel
(iii) anode to cathode
(iv) None of these

(i) cathode to anode

Q17. For principal quantum number n = 4, the total number of orbitals having l = 3 is

(i) 3
(ii) 7
(iii) 5
(iv) 9

(ii) 7

Q18. The energy of electron in the first Bohr orbit of H atom is 13.6 eV. The possible energy value (s) of the excited state(s) for electron in Bohr orbitals of hydrogen is (are)

(i) – 3.4 eV
(ii) -4.2eV
(iii) – 6.8 eV
(iv) + 6.8 eV

(i) – 3.4 eV

Q19. Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:

(i) 12 and 4
(ii) 12 and 5
(iii) 16 and 4
(iv) 16 and 5

(ii) 12 and 5

Q20. The lightest particle is

(i) positron
(ii) neutron
(iii) proton
(iv) None of these

(i) positron

Q21. Maximum number of electrons in a subshell with l = 3 and n = 4 is

(i) 10
(ii) 12
(iii) 14
(iv) 16

(iii) 14

Q22. Bohr atomic model can explain

(i) the spectrum of hydrogen atom only
(ii) spectrum of an atom or ion containing one electron only
(iii) the spectrum of hydrogen molecule
(iv) the solar spectrum

(ii) spectrum of an atom or ion containing one electron only

Q23. In Hydrogen atom, energy of first excited state is – 3.4 eV. Then find out KE of same orbit of Hydrogen atom

(i) 3.4 eV
(ii) 6.8 eV
(iii) -13.6 eV
(iv) +13.6 eV

(i) 3.4 eV

Q23. Neutron is discovered by

(i) Chadwick
(ii) Yukawa
(iii) Rutherford
(iv) Dalton

(i) Chadwick

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