Chemistry Notes for Class-9 Chapter-2

Structure of Atoms:

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Chemistry Ch#02, 9th Class

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1 / 41

In 1897, who found electrons in atom?

J.J. Thomson

Goldstein

William Crooks

Dalton

2 / 41

How many sub shells are there in first energy level or k shell?

02

03

01

04

3 / 41

¹³C and ¹⁴C are both present in nature_______

1.5 %

0.9 %

0.1 %

1.1 %

4 / 41

Who discovered the proton?

Gold stein

J.J. Thomson

Neil Bohr

Rutherford

5 / 41

Neil Bohr presented his model in_______

1913

1918

1926

1914

6 / 41

Which one of the following consists of three subshells?

N shell

L shell

O shell

M shell

7 / 41

Sir William Crooks performed experiments in a discharge tube at low pressure in_________

1893

1896

1895

1897

8 / 41

Plum pudding theory was put forward by_________

Crooks

Goldstein

Soddy

Thomson

9 / 41

The isotope C-12 is present in abundance of_____________

99.7%

97.6%

96.9%

None of these

10 / 41

How many times he mass of a proton is more than an electron?

1850

1840

1830

1820

11 / 41

Rutherford won noble prize in __________

1908

1906

1910

1902

12 / 41

Rutherford used a gold foil in his experiment, which has a thickness of___________

0.0001cm

0.002cm

0.001cm

0.00004cm

13 / 41

Which one of the following is the most penetrating?

Electrons

Neutrons

Alpha particles

Protons

14 / 41

The percentage of pure 238/92U is found in nature_______

100 %

97 %

99 %

98 %

15 / 41

John Dalton put forward his atomic theory in the beginning of________

19th Century

17th Century

16th Century

18th Century

16 / 41

The p subshell has_________

Four Orbitals

One Orbital

Two Orbitals

Three Orbitals

17 / 41

How many electrons can be accommodated in L-shell?

32

2

8

18

18 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

-1 0 e

1 0 P

1 0 n

19 / 41

How many electrons can be accommodated in p-orbital?

10

2

6

14

20 / 41

The concept of orbit was used by____________

Rutherford

J.J. Thomson

Planck

Bohr

21 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

1 0 P

1 0 n

-1 0 e

22 / 41

When U-235 breaks up, it produces_________

Protons

Electrons

Neutrons

Nothing

23 / 41

Neil Bohr won the noble prize in________

1914

1918

1926

1922

24 / 41

The value of Planck’s constant is_______

6.62x10(-19) Js

6.62x10(-12)Js

6.63x10(-34) Js

6.62x10(-24) Js

25 / 41

Canal Rays were discovered by_________

Crooks

Thomson

Dalton

Goldstein

26 / 41

In 1912 Neil Bohr joined for post-doctoral research with _________

Goldstein

Newton

Rutherford

Chadwick

27 / 41

According to Rutherford’s atomic theory atom should produce_________

Line Spectrum

Continuous Spectrum

Both A & B

None of These

28 / 41

Chadwick discovered neutrons in_____

1930

1934

1932

1925

29 / 41

Electronic configuration of Boron is______

1s2, 2p1

1s2, 2s2, 2p1

1s2, 2s1

1s2, 2s2

30 / 41

Which isotope is used for diagnosis of goiter?

Cobalt-60

St-90

lodine-131

P-32

31 / 41

Who described the concept of line spectrum in his atomic model?

Rutherford

Bohr

Both a & b

Chadwick

32 / 41

The number of electrons that a shell can accommodate is given by formula.

2n

n2

2n2

3n2

33 / 41

How many electrons can be accommodated in N-shell?

32

18

8

2

34 / 41

The name atom was derived from the Latin word “Atomos”, which meaning _________

Divisible

Stable

Indivisible

Reactive

35 / 41

Who predicted in 1920 that some neutral particle having mass equal to that of proton in an atom?

Rutherford

Goldstein

Bohr

Chadwick

36 / 41

Deuterium is used to make________

Soft Water

Heavy Water

Hard Water

Light Water

37 / 41

Which of the following results in the discovery of proton?

Alpha Rays

Cathode Rays

X-Rays

Canal Rays

38 / 41

Quantum means_________

High energy

Minimum energy

Variable energy

Fixed energy

39 / 41

Symbol for Deuterium is ________

3 1 H

2 1 H

1 1 H

1 0 H

40 / 41

Who performed first experiment to split atom?

Newton

Soddy

Rutherford

Bohr

41 / 41

Which radio isotope is used for the diagnosis of tumor in the body?

Phosphorous-30

Cobalt-60

Strontium-90

Iodine-131

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Chemistry Notes, Problems for Class 9th

Chemistry, a new subject for 9th Class, having a lot of concepts, starting from a single definition of the smallest particle of our universe which is called ‘atom’. In the 8th grade usually, we have to study only one book of science that combines chemistry, physics, and biology. But as, we got into 9th class and with every passing day things starts to get more complex now. similarly we got three books instead of just one science book.

And, if you any student of 9th Class feeling difficult to understand the concept of chemistry. Then, these chemistry notes for class 9 are enough. by Understanding chemistry Notes for 9th class means remembering a lot of concepts. Consider that particular subject important in which you want to study for your whole life. And, read more than just the textbook about that particular subject. If you think you want to study chemistry for your whole life that’s great, our country also need chemists.

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Chemistry class 9

Chemistry class 9 chapter 2, Chemistry class 9 pdf, Chemistry class 9 past papers, 

Chapter wise PDF Notes / Problems / Solution of Chemistry 9th Class

                     Chapter-01 – Fundamentals of Chemistry

                     Chapter-02 – Structure of Atoms 

                     Chapter-03 – Periodic Table and Periodicity of Properties

                     Chapter-04 – Structure of Molecules 

                     Chapter-05 – Physical States of Matter 

                     Chapter-06 – Solutions 

                     Chapter-07 – Electrochemistry 

                     Chapter-08 – Chemical Reactivity

                     Pairing Scheme for 2021 – Chemistry 9th Class