Class 9th chemistry Chapter 03 solved exercise pdf

Solved Exercise Class 9th Chemistry Chapter 03

Class 9th Chapter 03 solved exercise Long Questions

Class 9th Chapter 03 solved exercise Numericals

 

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Chapter 3 Past Paper MCQ's

1. long form of periodic table is constructed on the basis of?

A) Mendleeve
B) Atomic number
C) Atomic mass
D) Mass Number

ANSWER= (B) Atomic Number

 

2. The horizontal lines are called ?

A) periods
B) Atomic Number
C) groups
D) Mass number

ANSWER=A) periods

 

3. The vertical columns in periodic table are called ?

A) periods
B) Atomic Number
C) groups
D) Mass number

ANSWER=C) Groups

 

4. Modern periodic law is presented by ?

A) Dobereiner
B) Newland
C) Mendleeve
D) H.Moseley

ANSWER=D) H.Moseley

 

5. The number of groups in periodic table is ?

A) 8
B) 9
C) 18
D) 12

ANSWER=C) 18

 

6. The number of periods (horizontal rows) in modern periodic table is ?

A) 4
B) 5
C) 7
D) 9

ANSWER=C)7 (Seven)

 

7. second and third period consist of elements ?

A) 32
B) 8
C) 18
D) 2

ANSWER=B)8 (Seven)

 

8. first period contain elements ?

A) 32
B) 8
C) 18
D) 2

ANSWER=D) 2 (Seven)

 

9. 4th and 5th periods of the long form of the periodic table are called?

A) short period
B) normal period
C) long period
D) very long

ANSWER=C) long period

 

10. 6th period of periodic table have elements ?

A) 2
B) 8
C) 18
D) 32

ANSWER=D)32

 

11. The elements of first group are ?

A) alkali metals
B) alkaline earth matal
C) matalliods
D) halogens

ANSWER=A)Alkali metals

 

12. Which one of following element is not found in normal period ?

A) B
B) He
C) C
D) N

ANSWER=B)He-Helium

 

13. Which one is shortest period in periodic table ?

A) first period
B) second period
C) third period
D) fourth period

ANSWER=A) the first period

 

14. Which one of the following is not a noble gas

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

ANSWER= (B) Hydrogen

 

15. Which period of periodic table is incomplete

A) first
B) second
C) fourth
D) seven

ANSWER= (D) seven

 

16. number of elements in normal period is

A) 18
B) 10
C) 08
D) 32

ANSWER= (C) 08

 

17. group 17th belongs

A) Halogens
B) Noble gases
C) Alkali metals
D) None

ANSWER= (A) Halogens

 

18. Which one of the following decreases in a period of the periodic table?

A) Atomic radius
B) ionization energy
C) Electron affinity
D) None

ANSWER= (A) Atomic Radius

 

19. The radius of carbon atom in pm?

A) 154
B) 115
C) 77
D) 38

ANSWER= (C) 77

 

20. The atomic radii of the elements in the periodic table?

A) do not change from left to right in a period
B) decreases from top to bottom in a group
C) increases from left to right in a period
D) increases from top to bottom in a group

ANSWER= (D) increases from top to bottom in a group

 

21. which has least value of shielding effect?

A) Lithium
B) Sodium
C) Potassium
D) Rubidium

ANSWER= (A) Lithium

 

22. Ionization energy increases in period because?

A) number of shells increases
B) number of shells decreases
C) number of electrons decreases
D) force of attraction between Valence shell and nucleus increase

ANSWER= (D) force of attraction between Valence shell and nucleus increase

 

23. The amount pf energy given out when an electron is added to an atom is called?

A) Lattice energy
B) Ionization energy
C) Electronegativity
D) Electron affinity

ANSWER= (D) Electron affinity

 

24. Point out an incorrect statement about electron affinity?

A) it is measured in KJ/mol
B) decreases in period
C) it involves the release of energy
D) it decreases in group

ANSWER= (B) decreases in the period

 

25. which one of the following has the smallest atomic size?

A) Fluorine
B) Chlorine
C) Iodine
D) bromine

ANSWER= (A) Fluorine

 

26. The electronegativity of Fluorine is?

A) 4.0
B) 3.5
C) 2.6
D) 3.0

ANSWER= (A) 4.0

 

26. The electronegativity of Carbon is?

A) 4.0
B) 3.5
C) 2.6
D) 3.0

ANSWER= (C) 2.6

 

28. The electronegativity of Nitrogen is?

A) 4.0
B) 3.5
C) 2.6
D) 3.0

ANSWER= (B) 3.0

 

29. The electronegativity of Oxygen is?

A) 4.0
B) 3.5
C) 2.6
D) 3.4

ANSWER= (D) 3.4

 

30. The electronegativity of Cl is?

A) 4.0
B) 3.2
C) 2.6
D) 3.4

ANSWER= (B) 3.2

 

31. The distance between nuclei of two carbon atoms?

A) 154pm
B) 140pm
C) 110pm
D) 115pm

ANSWER= (A) 154pm

 

32. which have least value of electronegativity?

A) Li
B) Be
C) Br
D) F

ANSWER= (A) Li

 

33. which of following halogens have least value of electronegativity?

A) Iodine
B) Bromine
C) Chlorine
D) Fluorine

ANSWER= (A) Iodine

 

34. which of the following halogens have the highest value of electronegativity?

A) Iodine
B) Bromine
C) Chlorine
D) Fluorine

ANSWER= (D) Fluorine

 

35. Who discovered atomic numbers?

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

ANSWER= (B) Moseley

 

36. The 6th and 7th periods of the periodic table are called?

A) short
B) normal
C) long
D) very long

ANSWER= (D) very long

 

37. ionization energy of Sodium is in Kj/mol?

A) 377
B) 403
C) 419
D) 496

ANSWER= (D) 496

 

38. Mark incorrect statement about ionization energy?

A) it is measured in KJ/mol
B) it is absorption energy
C) it decrease in period
D) it decreases in a group

ANSWER= (C) it decreases in period