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

Which isotope is used for diagnosis of goiter?

Cobalt-60

P-32

lodine-131

St-90

2 / 41

Neil Bohr won the noble prize in________

1926

1922

1914

1918

3 / 41

Which one of the following is the most penetrating?

Neutrons

Electrons

Alpha particles

Protons

4 / 41

The concept of orbit was used by____________

J.J. Thomson

Bohr

Rutherford

Planck

5 / 41

¹³C and ¹⁴C are both present in nature_______

1.5 %

1.1 %

0.1 %

0.9 %

6 / 41

Plum pudding theory was put forward by_________

Soddy

Thomson

Goldstein

Crooks

7 / 41

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

1897

1896

1895

1893

8 / 41

According to Rutherford’s atomic theory atom should produce_________

None of These

Both A & B

Line Spectrum

Continuous Spectrum

9 / 41

How many electrons can be accommodated in L-shell?

18

2

8

32

10 / 41

Rutherford won noble prize in __________

1906

1908

1902

1910

11 / 41

How many electrons can be accommodated in N-shell?

32

8

18

2

12 / 41

Which one of the following consists of three subshells?

N shell

M shell

O shell

L shell

13 / 41

Which of the following results in the discovery of proton?

X-Rays

Canal Rays

Alpha Rays

Cathode Rays

14 / 41

Electronic configuration of Boron is______

1s2, 2s2, 2p1

1s2, 2s2

1s2, 2p1

1s2, 2s1

15 / 41

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

Chadwick

Bohr

Rutherford

Both a & b

16 / 41

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

Stable

Reactive

Indivisible

Divisible

17 / 41

The p subshell has_________

One Orbital

Four Orbitals

Two Orbitals

Three Orbitals

18 / 41

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

Rutherford

Goldstein

Newton

Chadwick

19 / 41

Who discovered the proton?

J.J. Thomson

Gold stein

Neil Bohr

Rutherford

20 / 41

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

03

02

01

04

21 / 41

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

Cobalt-60

Iodine-131

Phosphorous-30

Strontium-90

22 / 41

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

1840

1830

1850

1820

23 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

-1 0 e

1 0 P

4 2 He

1 0 n

24 / 41

Chadwick discovered neutrons in_____

1932

1925

1934

1930

25 / 41

When U-235 breaks up, it produces_________

Electrons

Nothing

Neutrons

Protons

26 / 41

How many electrons can be accommodated in p-orbital?

14

2

6

10

27 / 41

Neil Bohr presented his model in_______

1913

1914

1918

1926

28 / 41

The value of Planck’s constant is_______

6.62x10(-24) Js

6.62x10(-12)Js

6.63x10(-34) Js

6.62x10(-19) Js

29 / 41

In 1897, who found electrons in atom?

Dalton

William Crooks

J.J. Thomson

Goldstein

30 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

1 0 n

1 0 P

-1 0 e

31 / 41

Canal Rays were discovered by_________

Thomson

Dalton

Crooks

Goldstein

32 / 41

Symbol for Deuterium is ________

3 1 H

1 0 H

2 1 H

1 1 H

33 / 41

The isotope C-12 is present in abundance of_____________

96.9%

97.6%

99.7%

None of these

34 / 41

Quantum means_________

High energy

Fixed energy

Minimum energy

Variable energy

35 / 41

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

0.001cm

0.0001cm

0.00004cm

0.002cm

36 / 41

Deuterium is used to make________

Hard Water

Soft Water

Heavy Water

Light Water

37 / 41

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

98 %

100 %

99 %

97 %

38 / 41

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

n2

2n

2n2

3n2

39 / 41

Who performed first experiment to split atom?

Rutherford

Newton

Soddy

Bohr

40 / 41

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

Rutherford

Chadwick

Goldstein

Bohr

41 / 41

John Dalton put forward his atomic theory in the beginning of________

19th Century

17th Century

16th Century

18th Century

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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