Class 9th Chemistry Chapter 01 solved exercise notes

Solved Exercise Class 9th Chemistry Chapter 01 

 Board Past Papers important MCQ's

1.The study of manufacturing of chemical compounds on commercial scale is called ?

A) inorganic chemistry
B) industrial chemistry
C) Environmental Chemistry
D) Nuclear Chemistry

ANSWER= B) industrial chemistry

 

2.The Symbol used for Potassium element is ?

A) Na
B) Pt
C) P
D) K

ANSWER= D) K

 

3.Which element is found in most abundance in the atmosphere ?

A) Nitrogen
B) Oxygen
C) Argon
D) Chlorine

ANSWER= A) Nitrogen

 

4.the Number of naturally occuring element is ?

A) 92
B) 192
C) 114
D) 101

ANSWER= A) 92

 

5.% of oxygen in atmosphere is ?

A) 21
B) 22
C) 23
D) 24

ANSWER= A) 21

 

6.percentage of weight of hydrogen in ocean is?

A) 11
B) 12
C) 13
D) 14

ANSWER= A) 11

 

7.The chemical formula of washing soda is?

A) Na2CO3
B) Na2CO3.6H2O
C) Na2CO3.7H2O
D) Na2CO3.10H2O

ANSWER= D) Na2CO3.10H2O

 

8.% of Cl in Ocean is?

A) 1.8
B) 2.8
C) 3.8
D) 4.8

ANSWER= A) 1.8

 

9. The atomic number of element is represented by a symbol ?

A) K
B) L
C) A
D) Z

ANSWER= D) Z

 

10. The valency of Chromium is ?

A) 2
B) 3
C) 4
D) 5

 ANSWER= B) 3

 

11. The Valency of Phosphate radical is ?

A) -1
B) -2
C) -3
D) -4

 ANSWER= C) -3

 

12. The Valency of boron is ?

A) 1
B) 4
C) 3
D) 2

HANSWER= C) 3

 

13. The symbol of silver is ?

A) Si
B) S
C) Ag
D) Hg

 ANSWER= C) Ag

 

14. The element is found in most abundant on earth crust?

A) oxygen
B) Aluminum
C) silicon
D) iron

 ANSWER= A) Oxygen

 

15. The Valency of iron in Fe2(SO4)3 ?

A) 1
B) 2
C) 3
D) 4

 ANSWER= C) 3

 

16. The Valency of iron in FeSO4 is ?

A) +2
B) +3
C) +4
D) +5

 ANSWER= A) +2

 

17. mass of neutron is ?

A) 1.0073amu
B) 1.0080amu
C) 1.0087amu
D) 1.0097amu

 ANSWER= C) 1.0097

 

18. mass of proton is ?

A) 1.0073amu
B) 1.0080amu
C) 5.486 x 104amu
D) 6.486amu

ANSWER= A) 1.0073amu

 

19. Empirical formula of glucose is ?

A) CH2O
B) CHO
C) C2HO
D) C3H3O

ANSWER= A) CH2O

 

20. How many atoms of carbon are present in one mole of glucose ?

A) 11
B) 12
C) 6
D) 22

 ANSWER= C) 6

 

21. which one of following is empirical formula of benzene ?

A) C6H12O6
B) C6H6
C) CH2O
D) CH

 ANSWER= D) CH

 

22. Molar mass of Nitric Acid is ?

A) 63g
B) 63mg
C) 61amu
D) 61mg

ANSWER= A) 63g

 

23. formula mass of sodium chloride ?

A) 57.5
B) 58.5
C) 35.5
D) 18.5

ANSWER= B) 58.5

 

24. The molecular mass of Nitric acid HNO3 is ?

A) 65amu
B) 63mu
C) 62amu
D) 60amu

ANSWER= B) 63amu

 

25. the removal of electron from an atom give rise to ?

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

ANSWER= A) cation

 

26. The eaxmple of hetero atomic molecule is ?

A) H2
B) Cl2
C) O2
D) Hcl

ANSWER= D) HCl

 

27. Example of diatomic molecule ?

A) CO2
B) HCl
C) H2O
D) O2

ANSWER= D) O2

 

28. which one of following is diatomic molecule ?

A) H2SO4
B) C6H6
C) H2O
D) CO

ANSWER= D) CO

 

29. which one of following is polyatomic molecule ?

A) CO2
B) HCl
C) H2O
D) CH4

ANSWER= D) CH4

 

30. the number of moles in 9 grams of carbon is equivalent is ?

A) 0.25
B) 0.50
C) 0.75
D) 0.95

ANSWER= C) 0.75

 

31. the molecular mass of H2O is ?

A) 2
B) 3
C) 16
D) 18

ANSWER= D) 18

 

32. the number of moles in 6.0 gram H2O equivalent ?

A) 0.25
B) 0.33
C) 0.50
D) 0.75

ANSWER= B) 0.33

 

33. how many number of moles are equivalent to 11g of cO2 ?

A) 0.3
B) 0.25
C) 0.2
D) 0.15

ANSWER= B) 0.25

 

34. The number of moles of C in 4 grams of coal is ?

A) 0.25
B) 0.33
C) 0.50
D) 0.75

ANSWER= B) 0.33

 

35. Gram atomic mass of hydrogen is ?

A) 1.008g
B) 02.016g
C) 1.008amu
D) 2.016amu

ANSWER= A) 1.008g

 

36. The number of moles in 29.75 g of NaCl is equivalent to ?

A) 0.25
B) 0.21
C) 0.50
D) 0.75

ANSWER= c) 0.50

 

37. one gram molecule of sulphuric acid is equal to ?

A) 96g
B) 97g
C) 98g
D) 99g

ANSWER= c) 98g

 

38. 12g of Carbon contains ?

A) 6.02x10 power 23
B) 12.04x10 power 23
C) 1.672x10 power 23
D) 18.06x10 power 23

ANSWER= A) 6.02x10 power 23

 

39. % of N in Air ?

A) 70
B) 78
C) 21
D) 20

ANSWER= B) 78

 

40. Mass Number of an element is represented by ?

A) Z
B) A
C) N
D) K

ANSWER= B) A

 

41. The empirical formula of hydrogen peroxide is ?

A) CH
B) HO
C) CH2O
D) SiO

ANSWER= B) HO

 

42. Atomic number of calcium is ?

A) 11
B) 12
C) 19
D) 20

ANSWER= D) 20

 

43. The symbol of Avogadro number is ?

A) A
B) Z
C) NA
D) An

ANSWER= C) NA

 

44. which of following is not diatomic molecule is ?

A) H2
B) NH3
C) O2
D) HCl

ANSWER=B) NH3

 

45. which one of following is triatomic molecule ?

A) H2
B) N2
C) H2O
D) CO

ANSWER=C) H2O