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

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

0.001cm

0.002cm

0.0001cm

0.00004cm

2 / 41

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

99 %

100 %

97 %

98 %

3 / 41

The value of Planck’s constant is_______

6.62x10(-12)Js

6.62x10(-19) Js

6.62x10(-24) Js

6.63x10(-34) Js

4 / 41

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

Indivisible

Reactive

Stable

Divisible

5 / 41

Which one of the following consists of three subshells?

M shell

N shell

L shell

O shell

6 / 41

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

Goldstein

Bohr

Chadwick

Rutherford

7 / 41

Electronic configuration of Boron is______

1s2, 2s1

1s2, 2p1

1s2, 2s2, 2p1

1s2, 2s2

8 / 41

Neil Bohr won the noble prize in________

1914

1922

1926

1918

9 / 41

How many electrons can be accommodated in p-orbital?

10

2

6

14

10 / 41

Who discovered the proton?

Gold stein

J.J. Thomson

Rutherford

Neil Bohr

11 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

1 0 n

-1 0 e

1 0 P

12 / 41

The p subshell has_________

Three Orbitals

One Orbital

Four Orbitals

Two Orbitals

13 / 41

Neil Bohr presented his model in_______

1913

1914

1926

1918

14 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

1 0 P

1 0 n

4 2 He

-1 0 e

15 / 41

Chadwick discovered neutrons in_____

1934

1932

1925

1930

16 / 41

In 1897, who found electrons in atom?

Dalton

William Crooks

Goldstein

J.J. Thomson

17 / 41

According to Rutherford’s atomic theory atom should produce_________

Both A & B

Continuous Spectrum

Line Spectrum

None of These

18 / 41

John Dalton put forward his atomic theory in the beginning of________

19th Century

18th Century

16th Century

17th Century

19 / 41

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

01

02

03

04

20 / 41

Symbol for Deuterium is ________

1 0 H

2 1 H

3 1 H

1 1 H

21 / 41

The concept of orbit was used by____________

Bohr

Rutherford

Planck

J.J. Thomson

22 / 41

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

1850

1820

1830

1840

23 / 41

Plum pudding theory was put forward by_________

Thomson

Soddy

Crooks

Goldstein

24 / 41

Which isotope is used for diagnosis of goiter?

lodine-131

P-32

St-90

Cobalt-60

25 / 41

Which of the following results in the discovery of proton?

Canal Rays

X-Rays

Cathode Rays

Alpha Rays

26 / 41

How many electrons can be accommodated in N-shell?

18

8

2

32

27 / 41

Which one of the following is the most penetrating?

Neutrons

Alpha particles

Protons

Electrons

28 / 41

Who performed first experiment to split atom?

Bohr

Newton

Soddy

Rutherford

29 / 41

Rutherford won noble prize in __________

1906

1908

1902

1910

30 / 41

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

2n

3n2

2n2

n2

31 / 41

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

1896

1895

1897

1893

32 / 41

¹³C and ¹⁴C are both present in nature_______

1.1 %

0.1 %

0.9 %

1.5 %

33 / 41

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

Chadwick

Both a & b

Rutherford

Bohr

34 / 41

Quantum means_________

Minimum energy

Fixed energy

Variable energy

High energy

35 / 41

How many electrons can be accommodated in L-shell?

32

2

18

8

36 / 41

The isotope C-12 is present in abundance of_____________

99.7%

97.6%

None of these

96.9%

37 / 41

Canal Rays were discovered by_________

Thomson

Goldstein

Dalton

Crooks

38 / 41

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

Goldstein

Newton

Chadwick

Rutherford

39 / 41

Deuterium is used to make________

Light Water

Hard Water

Heavy Water

Soft Water

40 / 41

When U-235 breaks up, it produces_________

Electrons

Neutrons

Nothing

Protons

41 / 41

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

Iodine-131

Cobalt-60

Strontium-90

Phosphorous-30

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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