1st Year Chemistry Short Questions (Chapter 5)

 If you are in 1st year class

And searching for important short questions for your exams preparation than read it out 

Here is some short questions from chapter 5 of 1st year

CATHODE RAYS 

1. Which observations tell the presence of cathode rays in discharge tube?

2. Why is it necessary to decrease the pressure in discharge tube to get cathode rays?

3. Write four properties of cathode rays?

4. How will you prove that cathode rays are material particle with negative charge?

5. Which property of cathode rays show that they travel in a straight line?

6. Why e/m value of cathode rays is just equal to that of electron?

7. Whichever material is used as cathode, the nature of cathode rays remains same. Justify

8. Cathode rays can cause a chemical change. Justify

POSITIVE RAYS 

9. Why positive rays are also called canal rays?

10. What is the reason for the production of positive rays?

11. Write four properties of positive rays

12. The e/m value of positive rays for different gases is different but that of cathode rays the e/m value is same Justify

13. Why e/m value of positive rays obtained from hydrogen is less than cathode rays. Justify

NEUTRON 

14. How neutron was discovered?

15. How free neutron decay?

16. Write four properties of neutron 

17. What are slow and fast neutrons.

18. Write reactions of slow and fast neutrons. (What are nuclear reactions)

MEASUREMENT OF E/M VALUE & MASS OF ELECTRON

19. How e/m value of electron was measured?

20. How mass of electron was determined from its e/m value.

DISCOVERY OF NUCLEUS 

21. Write about Rutherford experiment

22. What was the observation made by Rutherford from his experiment 

23. What was the conclusion of Rutherford experiment?

24. Write defects of Rutherford experiments.

PLANKS QUANTUM THEORY 

25. Write main postulates of Plank's quantum theory?

26. Differentiate wavelength, wave no. & frequency 

27. Calculate frequency & wave no. of light having energy 10^-19

BOHR'S MODEL OF ATOM

28. Write main postulates of Bohr atomic model

29. What is fine or multiple structure?

30. What is Zeeman & Stark effect?

31. Write two defects of Bohr model.

32. Why potential energy of bounded electron is negative?

33. Velocity of electrons in higher orbits are less than those in lower orbits. Justify

34. What is H alpha line in hydrogen spectrum?

35. Justify that distance gaps b/w different orbits go on increasing from lower to higher orbits

SPECTRUM 

36. Define spectrum. Write names of rays present in white light

37. Define continuous and atomic spectrum.

38. What is difference b/w atomic emission and absorption spectrum.

X-RAYS & ATOMIC NO

39. How x-rays are produced?

40. How line spectrum of X-rays was obtained?

41. Write about Mosley's work about X-rays

42. What is the main conclusion of Mosley's experiment?

43. Define & give mathematical form of Mosley's law

44. Write about importance of Mosley's law.

DEBROGLIE'S CONCEPT & HEISENBERG PRINCIPLE 

45. What is De-Broglie's concept about dual nature of matter

46. Calculate wavelength of electron and stone of mass lg.

47. How dual nature of matter was verified?

48. What is Heisenberg 's uncertainty principle?

CONCEPT OF ORBITAL & QUANTUM NO

49. What is Schrodinger wave theory about atom?

50. Differentiate orbit & orbital.

51. What are quantum numbers?

52. What is function of Principal quantum no?

53. Explain Azimuthal quantum no?

54. Explain Magnetic quantum no?

55. Explain Spin quantum no?

56. Draw shapes of sand p subshells

ELECTRONIC DISTRIBUTION 

57. Define n+1 rule Page

58. Define Aufbau principle, Pauli exclusion principle & Hund's rule.

REGARDS : TALHA