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

John Dalton put forward his atomic theory in the beginning of________

17th Century

18th Century

16th Century

19th Century

2 / 41

Neil Bohr presented his model in_______

1914

1926

1913

1918

3 / 41

How many electrons can be accommodated in N-shell?

32

18

8

2

4 / 41

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

1897

1896

1895

1893

5 / 41

Symbol for Deuterium is ________

3 1 H

1 1 H

2 1 H

1 0 H

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

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

1830

1850

1840

1820

8 / 41

According to Rutherford’s atomic theory atom should produce_________

None of These

Both A & B

Continuous Spectrum

Line Spectrum

9 / 41

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

n2

3n2

2n2

2n

10 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

1 0 n

1 0 P

4 2 He

-1 0 e

11 / 41

The value of Planck’s constant is_______

6.62x10(-19) Js

6.62x10(-24) Js

6.63x10(-34) Js

6.62x10(-12)Js

12 / 41

In 1897, who found electrons in atom?

Dalton

William Crooks

Goldstein

J.J. Thomson

13 / 41

The concept of orbit was used by____________

Bohr

Rutherford

J.J. Thomson

Planck

14 / 41

¹³C and ¹⁴C are both present in nature_______

1.1 %

0.1 %

0.9 %

1.5 %

15 / 41

Deuterium is used to make________

Soft Water

Light Water

Heavy Water

Hard Water

16 / 41

Which of the following results in the discovery of proton?

Cathode Rays

Alpha Rays

X-Rays

Canal Rays

17 / 41

How many electrons can be accommodated in p-orbital?

2

14

6

10

18 / 41

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

Reactive

Divisible

Stable

Indivisible

19 / 41

Neil Bohr won the noble prize in________

1918

1922

1914

1926

20 / 41

When U-235 breaks up, it produces_________

Protons

Electrons

Neutrons

Nothing

21 / 41

The isotope C-12 is present in abundance of_____________

99.7%

96.9%

None of these

97.6%

22 / 41

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

Newton

Chadwick

Goldstein

Rutherford

23 / 41

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

02

01

03

04

24 / 41

Which one of the following is the most penetrating?

Neutrons

Protons

Alpha particles

Electrons

25 / 41

Chadwick discovered neutrons in_____

1930

1925

1932

1934

26 / 41

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

99 %

97 %

98 %

100 %

27 / 41

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

Phosphorous-30

Cobalt-60

Iodine-131

Strontium-90

28 / 41

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

0.002cm

0.001cm

0.00004cm

0.0001cm

29 / 41

How many electrons can be accommodated in L-shell?

8

32

18

2

30 / 41

The p subshell has_________

One Orbital

Two Orbitals

Three Orbitals

Four Orbitals

31 / 41

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

Both a & b

Bohr

Chadwick

Rutherford

32 / 41

Rutherford won noble prize in __________

1902

1906

1910

1908

33 / 41

Canal Rays were discovered by_________

Dalton

Crooks

Goldstein

Thomson

34 / 41

Plum pudding theory was put forward by_________

Soddy

Crooks

Goldstein

Thomson

35 / 41

Quantum means_________

Variable energy

High energy

Fixed energy

Minimum energy

36 / 41

Which one of the following consists of three subshells?

N shell

O shell

L shell

M shell

37 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

1 0 n

1 0 P

4 2 He

-1 0 e

38 / 41

Which isotope is used for diagnosis of goiter?

Cobalt-60

lodine-131

P-32

St-90

39 / 41

Who performed first experiment to split atom?

Soddy

Bohr

Rutherford

Newton

40 / 41

Who discovered the proton?

Neil Bohr

J.J. Thomson

Gold stein

Rutherford

41 / 41

Electronic configuration of Boron is______

1s2, 2p1

1s2, 2s2, 2p1

1s2, 2s1

1s2, 2s2

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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