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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 

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