Atomic Structure MCQs with Key | Exercises Chemistry

Prepared By

SHAH NAWAZ

M.E (QUEST)

Test Chapter 3

1. Dalton put forward the atomic theory

(a) 1808 (b) 1909

2. Cathode rays emit through gasses when

current is passed at

(a) 0.01 mm (b) 760 mm

3. T.V picture tube is an example of

(a) Cathode rays tube (b) G. Isler tube

4. Name of electron was suggested by

(a) J.J Thomson (b) W. Crooke

5. Mass of electron is

(a) 9.1 x 10–31 kg (b) 9.109 x 10–32 gm

6. The charge on an electron is

(a) 1.602 x 10–20 c (b) 1.602 x 10–18 c

7. The charge on the proton is

(a) + 1.602 x 10–19 c (b) zero

8. The charge on the neutron is

(a) 1.602 x 10–19 c (b) zero

9. The calculated e/m value of electron is

(a) 1.602 x 1019 c kg–1 (b)1.758 x 10–11c kg–1

10. The mass of proton is

(a) 9.11 x 10–31 kg (b) 1.676 x 10–27 kg

11. The mass of neutron is

(a) 1.675 x 10–27 kg (b) 1.675 x 10–25 kg

12. Proton was discovered from

(a) Canal rays (b) Positive rays

13. Which element gives the positive rays

with the highest e/m ratio?

(a) Hydrogen (b) Helium

14. Rays which are non-material in nature

and have wave length shorter than X-rays

are

(a) α-rays (b) β-Rays

15. Velocity of α-rays is

(a) 10 times fast than light

(b) Ten times slow than light

16. Which are the more ionizer of gasses

(a) X-rays (b) β-rays

17. Rays which contain two protons and

two neutrons are

(a) X-rays (b) β-rays

18. Radius of orbit of an electron and

velocity of electron are

(a) directly proportional to each other

(b) inversely proportional to each other

(d) none of these

19. Bombardment or Helium nuclei or a

particles on the Beryllium nuclei is the

experiment of

(a) Rutherford (b) Chadwick

20. Rainbow is an example of

(a) Continuous spectrum

(b) Discontinuous spectrum

(d) Absorption spectrum

21. Visible light has wave length

(a) 4000 to 7500 OA (b) 4000 OA

22. Which serves as finger print for the

identification of elements

(a) Line spectrum

(b) Continuous spectrum

(d)Absorption spectrum.

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Prepared By SHAH NAWAZ

Test Chapter 3

1. Dalton put forward the atomic theory in (a) 1808 (b) 1909 (c) 1859 (d) 1895 2. Cathode rays emit through gasses when current is passed at (a) 0.01 mm (b) 760 mm (c) 1 mm (d) 1 am 3. T.V picture tube is an example of (a) Cathode rays tube (b) G. Isler tube (c) A&B (d) X-rays tube 4. Name of electron was suggested by (a) J.J Thomson (b) W. Crooke (c) Stony (d) J. Perin 5. Mass of electron is (a) 9.1 x 10–^31 kg (b) 9.109 x 10–^32 gm (c) 8.1 x 10–^31 g (d) 9.1 x 10–^31 mg 6. The charge on an electron is (a) 1.602 x 10–^20 c (b) 1.602 x 10–^18 c (c) 1.602 x 10–^19 c (d) 1.602 x 10–^21 c 7. The charge on the proton is (a) + 1.602 x 10–^19 c (b) zero (c) – 1.602 x 10^19 c (d) 1.602 x 10–^19 c 8. The charge on the neutron is (a) 1.602 x 10–^19 c (b) zero (c) – 1.602 x 10–^19 c (d) + 1.602 x 10–^19 c 9. The calculated e/m value of electron is (a) 1.602 x 10^19 c kg–^1 (b)1.758 x 10–^11 c kg–^1 (c) 1.758 x 10–^13 c kg–^1 (d) 1.759 x 10^9 c kg 10. The mass of proton is (a) 9.11 x 10–^31 kg (b) 1.676 x 10–^27 kg (c) 1.60 x 10–^19 kg (d) 1.675 x 10–^27 kg 11. The mass of neutron is (a) 1.675 x 10–^27 kg (b) 1.675 x 10–^25 kg (c) 9.11 x 10–^31 kg (d) 1.60 x 10–^19 kg 12. Proton was discovered from (a) Canal rays (b) Positive rays (c) Goldstein rays (d) All 13. Which element gives the positive rays with the highest e/m ratio? (a) Hydrogen (b) Helium (c) Oxygen (d) Neon 14. Rays which are non-material in nature and have wave length shorter than X-rays are (a) α-rays (b) β-Rays (c) γ-rays (d) Cathode rays. 15. Velocity of α-rays is (a) 10 times fast than light (b) Ten times slow than light (c) Equal to light (d) All. 16. Which are the more ionizer of gasses (a) X-rays (b) β-rays (c) α-rays (d) γ-rays 17. Rays which contain two protons and two neutrons are (a) X-rays (b) β-rays (c) α-rays (d) γ-rays 18. Radius of orbit of an electron and velocity of electron are (a) directly proportional to each other (b) inversely proportional to each other (c) independent to each other (d) none of these 19. Bombardment or Helium nuclei or a particles on the Beryllium nuclei is the experiment of (a) Rutherford (b) Chadwick (c) J.J. Thomson (d) Moseley 20. Rainbow is an example of (a) Continuous spectrum (b) Discontinuous spectrum (c) Line spectrum (d) Absorption spectrum 21. Visible light has wave length (a) 4000 to 7500 OA (b) 4000 OA (c) 7500 OA (d) Below 4000 OA 22. Which serves as finger print for the identification of elements (a) Line spectrum (b) Continuous spectrum (c) Emission spectrum (d)Absorption spectrum.

Prepared By SHAH NAWAZ

23. X-rays are (a) Waves of energy (b) Positive particles (c) Negative particles (d) Neutral particles. 24. Frequency X-rays depend on (a) Nature of cathode (b) Nature of anode (c) Amount of current (d) Nature of gas. 25. Radius of First orbit of Hydrogen atom is (a) 0.529 OA (b) 5.29 °A (c) 52.9 OA (d) None. 26. The distance between the two adjacent crests or troughs is called (a) wave number (b) frequency (c) wavelength (d) amplitude 27. Alpha rays are actually (a) 1 proton 2 neutrons (b) 2 protons 2 electrons (c) 2 protons 2 neutrons (d) 2 protons 1 neutron 28. Which have better penetrating power (a) Alpha rays (b) Beta rays (c) Gamma rays (d) X-rays 29. The red colour have the wavelength (a) 600-630 (b) 630- (c) 100-200 (d) None 30. Photons of yellow colour are energetic than violet colour (a) More (b) Less (c) Equal (d) None 31. Which is the units of length (a) Angstrom (b) Poise (c) H (d) None 32. When electron absorb energy in stationary orbit (a) It jumps to the lower energy level (b) There is no change in energy (c) There is no change in energy level (d) It jumps to the higher energy level 33. Layman series of lines in Hydrogen spectrum is in.............region. (a) U. V region (b) Visible region (c) IR region (d) Far IR region 34. The series which is further divided into smaller lines is called (a) Balmer (b) Pfund (c) Brackets series (d) Lyman 35. Balmer Series was discovered in (a) 1867 (b) 1887 (c) 1789 (d) 1901 36. The wave number decrease from (a) Lyman to Pfund (b) Pfund to Lyman (c) Balmer to Bracket (d) None of these 37. When an electron jumps in n1 orbit the series of spectral lines obtained is called (a) Balmer (b) Pfund (c) Brackets series (d) Lyman 38. × 𝟏𝟎𝟑^ is wave number of spectral line (a) Hα (b) Hβ (c) Hγ (d) Hω 39. Total number of series in hydrogen spectrum is (a) Three (b) four (c) five (a) six 40. Bracket series is obtained when all transition of electron terminate on (a) 4th^ orbit (b) 5th^ orbit (c) 3rd^ orbit (d) 2nd^ orbit 41. Bracket's series of lines in Hydrogen spectrum is in.........region. (a) U.V region (b) Visible region (c) IR region (d) Far LR region 42. When the excited electron of Hydrogen falls from higher orbit to the lower orbit n - 4 then the rays emitted are (a) Visible rays (b) U.V rays (c) LR rays (d) Far IR rays 43. Value of lower orbit n, for the Ballmer's series is (a) 2 (b) I (c) 3 (d) 4.

Prepared By SHAH NAWAZ

64. Which is the correct order of size (a) Cation <Anion <Atom (b) Anion<Cation<Atom (c) Cation<Atom <Anion (d) None. 65. Which is the trend of lonization potential (I.P) in the periodic table (a) It decreases from left to right (b) It decreases from top to bottom (c) It decreases from bottom to top (d) It increases from right to left 66. The correct order of I.P is (a) First I.P> Second I.P >Third I.P (b) First I.P <Second I.P <Third I.P (c) First IP = Second I.P = Third I.P (d) None. 67. Electro negativity is zero for elements of group (a) IA Alkali metals (b) VIIIA Noble gasses (c) VIIA Halogens (d) II Alkaline Earth Metals 68. Every element in a group with more E.N is at (a) Top (b) Bottom (c) Middle (d) Second number 69. Element with more E.N in the periodic table is (a) F (b) Cl (c) Na (d) S 70. Electro negativity of Fluorine F is (a) 4.0 (b) 3. (c) 3.0 (d) 2. 71. Electro negativity of Francium Fr is (a) 4.0 (b) 0. (c) 0.9 (d) 2. 72. Bond between two atoms is ionic if the difference of Electro negativity is (a) 1.7 (b) More than 1. (c) Less than 1.7 (d) 2. 73. Electron affinity of all the elements is negative except (a) F (b) H

74. If an electron is moving with a velocity of 2.188 x 10^6 m/s then its wavelength will be (a) 0.33 x 106 nm (b) 0.33 x 10–2 nm (c) 0.33 nm (d) 0.22 nm 75. If a stone of 1gm is many with a velocity of 100m/s then its wavelength will be (a) 6.65 x 10–^35 m (b) 6.65 x 10–^34 m (c) 6.65 x 10–^33 m (d) 6.65 x 10–^32 m

Atomic Structure MCQs with Key, Exercises of Chemistry

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Partial preview of the text

Download Atomic Structure MCQs with Key and more Exercises Chemistry in PDF only on Docsity!

Test Chapter 3

Q.NO KEY Q.NO KEY

1 A 48 D

2 A 49 B

3 C 50 B

4 C 51 A

5 A 52 A

6 C 53 D

7 A 54 C

8 B 55 D

9 B 56 C

10 B 57 A

11 A 58 B

12 D 59 A

13 A 60 A

14 C 61 C

15 B 62 B

16 C 63 D

17 C 64 C

18 B 65 B

19 B 66 B

20 A 67 B

21 A 68 A

22 A 69 A

23 A 70 A

24 B 71 B

25 A 72 B

26 C 73 C

27 C 74 C

28 B 75 A

29 B

30 B

31 A

32 D

33 A

34 A

35 B

36 A

37 D

38 B

39 C

40 A

41 D

42 D

43 A

44 C

45 D

46 B

47 C