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

Who performed first experiment to split atom?

Newton

Rutherford

Bohr

Soddy

2 / 41

Which one of the following consists of three subshells?

N shell

M shell

O shell

L shell

3 / 41

Chadwick discovered neutrons in_____

1925

1934

1932

1930

4 / 41

When U-235 breaks up, it produces_________

Nothing

Neutrons

Protons

Electrons

5 / 41

Neil Bohr presented his model in_______

1913

1914

1918

1926

6 / 41

How many electrons can be accommodated in p-orbital?

10

2

14

6

7 / 41

How many electrons can be accommodated in N-shell?

2

32

18

8

8 / 41

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

1897

1893

1896

1895

9 / 41

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

Rutherford

Both a & b

Chadwick

Bohr

10 / 41

Which of the following results in the discovery of proton?

Alpha Rays

Canal Rays

Cathode Rays

X-Rays

11 / 41

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

99 %

100 %

97 %

98 %

12 / 41

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

Strontium-90

Iodine-131

Cobalt-60

Phosphorous-30

13 / 41

Deuterium is used to make________

Heavy Water

Light Water

Hard Water

Soft Water

14 / 41

Symbol for Deuterium is ________

1 1 H

3 1 H

2 1 H

1 0 H

15 / 41

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

Bohr

Rutherford

Goldstein

Chadwick

16 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

1 0 P

-1 0 e

1 0 n

17 / 41

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

1820

1840

1830

1850

18 / 41

Which one of the following is the most penetrating?

Electrons

Protons

Neutrons

Alpha particles

19 / 41

In 1897, who found electrons in atom?

Dalton

J.J. Thomson

William Crooks

Goldstein

20 / 41

Electronic configuration of Boron is______

1s2, 2s1

1s2, 2p1

1s2, 2s2, 2p1

1s2, 2s2

21 / 41

The isotope C-12 is present in abundance of_____________

96.9%

None of these

99.7%

97.6%

22 / 41

Which isotope is used for diagnosis of goiter?

Cobalt-60

St-90

P-32

lodine-131

23 / 41

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

Goldstein

Newton

Rutherford

Chadwick

24 / 41

Who discovered the proton?

Neil Bohr

Gold stein

J.J. Thomson

Rutherford

25 / 41

The p subshell has_________

One Orbital

Four Orbitals

Three Orbitals

Two Orbitals

26 / 41

Rutherford won noble prize in __________

1910

1908

1902

1906

27 / 41

How many electrons can be accommodated in L-shell?

8

2

32

18

28 / 41

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

0.001cm

0.00004cm

0.002cm

0.0001cm

29 / 41

According to Rutherford’s atomic theory atom should produce_________

None of These

Both A & B

Line Spectrum

Continuous Spectrum

30 / 41

¹³C and ¹⁴C are both present in nature_______

0.9 %

1.5 %

1.1 %

0.1 %

31 / 41

Quantum means_________

High energy

Variable energy

Minimum energy

Fixed energy

32 / 41

John Dalton put forward his atomic theory in the beginning of________

16th Century

18th Century

17th Century

19th Century

33 / 41

The concept of orbit was used by____________

Planck

J.J. Thomson

Rutherford

Bohr

34 / 41

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

Reactive

Stable

Divisible

Indivisible

35 / 41

Canal Rays were discovered by_________

Thomson

Dalton

Goldstein

Crooks

36 / 41

Plum pudding theory was put forward by_________

Goldstein

Crooks

Thomson

Soddy

37 / 41

Neil Bohr won the noble prize in________

1914

1922

1926

1918

38 / 41

The value of Planck’s constant is_______

6.62x10(-24) Js

6.63x10(-34) Js

6.62x10(-19) Js

6.62x10(-12)Js

39 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

1 0 n

-1 0 e

4 2 He

1 0 P

40 / 41

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

04

02

03

01

41 / 41

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

2n2

3n2

n2

2n

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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