Class 9th chemistry Chapter 02 solved exercise pdf

 Solved Exercise Class 9th Chemistry Chapter 02 

 

1. Who discovered the neutron?

 A) Goldstein
 B) Bohr
 C) Chadwick
 D) Rutherford

ANSWER=C) Chadwick

2. The scientist who put forth the plum pudding theory?

 A) Bohr
 B) Thomson
 C) Dalton
 D) Rutherford

ANSWER=B) Thomson

 

3. Which of the following results in the discovery of electron?

 A) Cathode rays
 B) Canal rays
 C) X-rays
 D) alpha Rays

ANSWER=A) Cathode rays

 

4. Who proposed quantum theory?

 A) Neil Bohr
 B) Dalton
 C) Thomson
 D) Max Plank

ANSWER=D) Max Plank

 

5. Who discovered cathode rays?

 A) Gold stein
 B) John Dalton
 C) Thomson
 D) Neil Bohr

ANSWER=C) J.J.thomson

 

6. Who is the father of nuclear science ?

 A) Neil Bohr
 B) Rutherford
 C) Max Plank
 D) Thomson

ANSWER=B) Rutherford

 

7. In discharge tube the canal rays are produced due to?

 A) presence of the anode
 B) due to ionization of gas molecules
 C) presence of a cathode
 D) due to high pressure of a gas

ANSWER=B) due to ionization of gas molecules

 

8. who introduced the concept of orbit around the nucleus?

 A) J.J Thomson
 B) Rutherford
 C) Bohr
 D) Planks

ANSWER=C) Bohr

 

9. The nucleus of an atom contains?

 A) Electrons
 B) Electrons and protons
 C) Electrons and neutrons
 D) protons nad neutrons

ANSWER=D) protons nad neutrons

 

10. The atomic number of fluorine is?

 A) 2
 B) 4
 C) 5
 D) 9

ANSWER=D) 9

 

11. the maximum electrons in N-shell are ?

 A) 32
 B) 18
 C) 8
 D) 2

ANSWER=D) 32

 

12. Number of neutrons of potassium is ?

 A) 19
 B) 20
 C) 39
 D) 18

ANSWER=A) 19

 

13. The Atomic number of Argon Ar is ?

 A) 16
 B) 10
 C) 8
 D) 18

ANSWER=D) 18

 

14. The number of electrons in the valence shell of noble gasses?

 A) 8
 B) 6
 C) 7
 D) 17

ANSWER=A) 8

 

15. which one is the second energy level?

 A) K
 B) L
 C) M
 D) N

ANSWER=B) L

 

16. The maximum electrons in K-shell are ?

 A) 2
 B) 8
 C) 18
 D) 32

ANSWER=A) 2

 

17. after gaining one electron chlorine atom attains the electronic configuration which noble gases?

 A) Helium
 B) Neon
 C) Argon
 D) Krypton

ANSWER=C) Argon

18. an element has 5 electrons in M shell its atomic number will be?

 A) 5
 B) 10
 C) 15
 D) 13

ANSWER=C) 15

 

19. The electronic configuration of K is ?

 A) [He]2s1
 B) [Ne]3s1
 C) [Kr]4s1
 D) [Ar]4s1

ANSWER=D) [Ar]4s1

 

20. The maximum number of electrons in L shell is ?

 A) 2
 B) 8
 C) 18
 D) 32

ANSWER=B) 8

 

21. M shell can accomodate maximum number of electrons ?

 A) 2
 B) 8
 C) 18
 D) 32

ANSWER=C) 18

 

22. the general configuration of Noble gases is ?

 A) ns2.np3
 B) ns2.np4
 C) ns2.np6
 D) ms2.np5

ANSWER=C) ns2.np6

 

23. after gaining electron chlorine atom become?

 A) cation
 B) anion
 C) molecular cation
 D) molecular anion

ANSWER=B) anion

 

24. which element has no neutron in its atoms?

 A) hydrogen
 B) oxygen
 C) nitrogen
 D) carbon

ANSWER=A) hydrogen

 

25. The isotopes of carbon are ?

 A) 2
 B) 3
 C) 4
 D) 5

ANSWER=B) 3

 

26. Uranium Has isotopes are?

 A) two
 B) three
 C) four
 D) five

ANSWER=B) Three

 

27. which one is radioactive isotope ?

 A) C-11
 B) C-12
 C) C-13
 D) C-14

ANSWER=D) C-14

 

28. Isotopes of hydrogen are ?

 A) 2
 B) 3
 C) 1
 D) 4

ANSWER=B) 3

 

29. The isotope used to generate electricity in nuclear reactor ?

 A) C-12
 B) U-235
 C) Co-60
 D) P-32

ANSWER=B) U-235

 

30. Which one of the following is used for cancer treatment within the body?

 A) P-32
 B) U-235
 C) I-131
 D) Co-60

ANSWER=D) Co-60

 

31. charge on neutron?

 A) negative
 B) positive
 C) No
 D) partial proton

ANSWER=C) No

 

32. ----Consist of four subshells?

 A) K shell
 B) L shell
 C) M shell
 D) N shell

ANSWER=D) N-shell

 

33. C-14 has neutrons?

 A) 6
 B) 8
 C) 10
 D) 12

ANSWER=B) 8

 

34. The number of subshells in the N shell is?

 A) 1
 B) 2
 C) 3
 D) 4

ANSWER=C) 3

 

35. The valency of elemnets of group-2 is?

 A) 4
 B) 1
 C) 3
 D) 2

ANSWER=d) 2