MDCAT XI Chemistry Atomic Structure Online Test-2

277

Created on June 14, 2025 By

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📚 Test Details

Subject: Chemistry
Class: 1st year / XI
Chapter Name: Atomic Structure
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes

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1 / 50

1. The chemical and physical properties of protium depend upon:
I. Electron
II. Proton
III. Neutron

a) I, II, III

b) I

c) II, III

d) I, II

2 / 50

2. The fundamental particles discovered through artificial radioactivity are:

a) Electron

b) Proton

c) Positron and neutron

d) Neutron

3 / 50

3. According to Rutherford’s model, if we focus on the last electron of an element X, the distance between nucleus and electron is --------, and a continuous spectrum of -------- frequency is produced.

a) Decrease, increase

b) Decrease, decrease

c) Decrease, unchanged

d) Increase, unchanged

e) Increase, decrease

4 / 50

4. Identify the correct statements about Rutherford’s model:
I. He said elements have a continuous spectrum.
II. He used classical physics concepts.
III. He said electron shells must be spiral where electrons revolve.

a) I, II, III

b) I, II

c) II, III

d) I only

5 / 50

5. When an electron is removed from four different gaseous elements:

a) The nature of electrons is the same.

b) The nature of electrons is different because of residual gases.

c) The nature of electrons is the same because all are gases.

d) The nature of electrons is different because of voltage.

6 / 50

6. The Bohr model is applicable for:

a) He

b) Li³⁺

c) Be³⁺

d) H⁺

7 / 50

7. The spectrum having bright lines on a dark background is called:

a) Absorption line spectrum

b) Absorption continuous spectrum

c) Emission line spectrum

d) Emission continuous spectrum

8 / 50

8. The spectrum of hydrogen is studied using:

a) Spectroscopic techniques

b) Crookes tube

c) Voltage effective method

d) Schrödinger method

9 / 50

9. The isotope of carbon used in archaeological studies is:

a) C₁₂

b) C₁₃

c) C₁₄

d) C₁₅

10 / 50

10. The maximum number of electrons in a sub-shell with ℓ = 3 and n = 5 is:

a) 2

b) 5

c) 32

d) 14

11 / 50

11. Two electrons can have the same values of how many quantum numbers?

a) 1

b) 2

c) 3

d) 4

12 / 50

12. The azimuthal quantum number defines the:

a) e/m ratio of electrons

b) Spin of electron

c) Shape of orbital

d) Magnetic momentum of electron

13 / 50

13. Which law represents the pairing of electrons in a sub-shell after each orbital is filled with one electron?

a) Pauli’s Exclusion Principle

b) Hund’s Rule

c) Heisenberg’s Principle

d) Hess’s Law

14 / 50

14. The size and energy of an atomic orbital are associated with:

a) Principal quantum number

b) Magnetic quantum number

c) Angular momentum quantum number

d) Spin quantum number

15 / 50

15. Which of the following orbitals has two lobes?

a) s orbital

b) p orbital

c) f orbital

d) dz² orbital

e) B and D

16 / 50

16. The number of nodal planes in a 3s orbital is:

a) 1

b) 2

c) 3

d) 0

17 / 50

17. Arrange the following orbitals in decreasing energy order: 4d, 5p, 5f, and 6p.

a) 5f > 6p > 4d > 5p

b) 5f > 6p > 5p > 4d

c) 6p > 5f > 5p > 4d

d) 6p > 5f > 4d > 5p

18 / 50

18. The highest ionization potential belongs to:

a) 4f

b) 5d

c) 6p

d) 7s

19 / 50

19. If an electron has potential energy = P and kinetic energy = K, then its total energy (T) is:

a) T = –K + P

b) T = –K

c) T = –P

d) T = ½ K

20 / 50

20. When an electron in hydrogen falls back to the second excited state, it falls in which series?

a) Lyman

b) Balmer

c) Paschen

d) Brackett

21 / 50

21. Identify the electron moving in the third orbit with dumbbell-shaped orbital and clockwise spin:

a) n = 3, m = 3, s = +½

b) n = 3, ℓ = 2, s = +½

c) n = 3, ℓ = 2, s = –½

d) n = 3, ℓ = 3, s = +½

22 / 50

22. Who considered the motion of an electron as a wave?

a) Schrödinger

b) Pauli

c) Hund

d) de Broglie

23 / 50

23. The possible number of orbitals in n = 4 is:

a) 4

b) 8

c) 16

d) 32

24 / 50

24. Which has the better ionizing power?

a) Alpha rays

b) Beta rays

c) Gamma rays

d) X-rays

25 / 50

25. The failure of Bohr’s atomic model is due to his assumption that:

a) Electrons in a particular orbit do not radiate energy

b) Energy is radiated when an electron jumps from its orbit

c) Electrons revolve in fixed circular orbits

d) Angular momentum of an electron is nh/2π

26 / 50

26. The two electrons in lithium differ in which quantum number?

a) n

b) ℓ

c) m

d) s

27 / 50

27. When the 3d orbital is filled, the next electron enters into:

a) 4s

b) 4d

c) 5s

d) 4p

28 / 50

28. Which of the following produces positive rays with the minimum charge-to-mass (e/m) ratio?

a) Hydrogen

b) Beryllium

c) Nitrogen

d) All gases have the same e/m ratio

29 / 50

29. According to Planck’s quantum theory:
I. Energy travels in a discontinuous manner.
II. Energy change occurs in the form of wave packets.
III. Energy of a photon is inversely proportional to its wavelength.
IV. Energy emitted or absorbed is quantized.

a) I only

b) I and IV

c) I, II, and IV

d) I, II, III, and IV

30 / 50

30. An orbital cannot contain more than two electrons according to:

a) Aufbau’s Principle

b) Pauli’s Exclusion Principle

c) Hund’s Rule

d) n + ℓ Rule

31 / 50

31. Degenerate orbitals must have:
I. Same energy
II. Same shape
III. Same lobes

a) I, II, III

b) I

c) I, II

d) II, III

32 / 50

32. Brackett series appears in the hydrogen spectrum if an electron jumps from any higher energy level to the:

a) 2nd orbit

b) 3rd orbit

c) 4th orbit

d) 5th orbit

33 / 50

33. The atomic orbital is:

a) The circular path of the electron

b) Elliptical shaped orbit

c) Three-dimensional field around the nucleus

d) The region in which there is a maximum probability of finding an electron

34 / 50

34. According to the Aufbau principle, a new electron enters the orbital where:

a) (n + ℓ) is minimum

b) (n + ℓ) is maximum

c) (n + m) is minimum

d) (n + m) is maximum

35 / 50

35. Which of the following is not permissible?

a) n = 4, ℓ = 3, m = 0

b) n = 4, ℓ = 2, m = 1

c) n = 4, ℓ = 4, m = 1

d) n = 4, ℓ = 0, m = 0

36 / 50

36. Principal, azimuthal, and magnetic quantum numbers are respectively related to:

a) Size, shape, and orientation

b) Shape, size, and orientation

c) Size, orientation, and shape

d) None of the above

37 / 50

37. Centrifugal forces in an atom are balanced by:

a) Attractive forces

b) Repulsive force

c) Electrons

d) Neutrons

38 / 50

38. The maximum number of orbitals present in a subshell with azimuthal quantum number ℓ = 3 is:

a) 14

b) 3

c) 12

d) 7

39 / 50

39. Rutherford bombarded __________ particles in the discovery of the nucleus.

a) Gamma-rays

b) Alpha-rays

c) Beta-rays

d) X-rays

40 / 50

40. Charge of the electron was measured by:

a) J. J. Thomson

b) Millikan

c) Rutherford

d) Perrin

41 / 50

41. Colour produced during fluorescence by cathode rays depends upon:

a) Temperature

b) Pressure

c) Volume

d) Composition of glass

42 / 50

42. Sodium produces two yellow spectral lines because of:

a) Different wavelengths

b) Different colours

c) Different intensities

d) All have little contribution

43 / 50

43. Space around the nucleus where the probability of finding an electron is maximum is called:

a) Orbital

b) Orbit is elliptical

c) Subshell

d) Electron cloud

44 / 50

44. When a fast-moving electron strikes heavy metal, it produces:

a) Beta-rays

b) Alpha-rays

c) X-rays

d) Gamma-rays

45 / 50

45. Shape of the s orbital is:

a) Dumbbell

b) Double dumbbell

c) Spherical

d) Complicated

46 / 50

46. Which of the following has the maximum penetrating power and is deflected toward the positive pole?

a) Alpha

b) Beta

c) Gamma

d) None of these

47 / 50

47. If an electron jumps from the 1st to the 3rd orbit, the energy given is:

a) –12.08 eV

b) –1.51 eV

c) 13.6 eV

d) 12.08 eV

48 / 50

48. The idea that an atom cannot be divided was proposed by which scientist?

a) Rutherford

b) Dalton

c) Bohr

d) Schrödinger

49 / 50

49. What is the maximum number of electrons that can be associated with the quantum numbers:
n = 2, ℓ = 1, m = 0, s = +½?

a) 2

b) 6

c) 4

d) 1

50 / 50

50. When electrons in hydrogen and Li²⁺ move from the 1st to the 3rd orbit, which has a larger radius, and by how much?

a) Hydrogen, 9 times

b) Lithium, 9 times

c) Both have equal radius

d) Lithium, 3 times

e) Hydrogen, 3 times

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MDCAT XI Chemistry Atomic Structure Online Test-2

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