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________

18th Century

16th Century

19th Century

17th Century

2 / 41

Which one of the following is the most penetrating?

Protons

Alpha particles

Neutrons

Electrons

3 / 41

According to Rutherford’s atomic theory atom should produce_________

Line Spectrum

None of These

Both A & B

Continuous Spectrum

4 / 41

Rutherford won noble prize in __________

1910

1906

1908

1902

5 / 41

When U-235 breaks up, it produces_________

Nothing

Protons

Neutrons

Electrons

6 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

-1 0 e

1 0 n

4 2 He

1 0 P

7 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

-1 0 e

1 0 P

1 0 n

8 / 41

How many electrons can be accommodated in N-shell?

8

18

2

32

9 / 41

Which of the following results in the discovery of proton?

Cathode Rays

Alpha Rays

Canal Rays

X-Rays

10 / 41

The value of Planck’s constant is_______

6.63x10(-34) Js

6.62x10(-24) Js

6.62x10(-19) Js

6.62x10(-12)Js

11 / 41

Neil Bohr won the noble prize in________

1918

1926

1922

1914

12 / 41

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

Rutherford

Bohr

Both a & b

Chadwick

13 / 41

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

Rutherford

Chadwick

Newton

Goldstein

14 / 41

In 1897, who found electrons in atom?

Goldstein

J.J. Thomson

William Crooks

Dalton

15 / 41

Who discovered the proton?

Rutherford

Gold stein

Neil Bohr

J.J. Thomson

16 / 41

Which one of the following consists of three subshells?

O shell

M shell

N shell

L shell

17 / 41

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

04

03

01

02

18 / 41

Symbol for Deuterium is ________

1 1 H

2 1 H

1 0 H

3 1 H

19 / 41

¹³C and ¹⁴C are both present in nature_______

1.1 %

1.5 %

0.9 %

0.1 %

20 / 41

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

2n

2n2

n2

3n2

21 / 41

The concept of orbit was used by____________

Planck

Bohr

J.J. Thomson

Rutherford

22 / 41

How many electrons can be accommodated in p-orbital?

10

14

6

2

23 / 41

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

Strontium-90

Iodine-131

Cobalt-60

Phosphorous-30

24 / 41

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

99 %

98 %

100 %

97 %

25 / 41

Canal Rays were discovered by_________

Thomson

Dalton

Crooks

Goldstein

26 / 41

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

0.002cm

0.00004cm

0.0001cm

0.001cm

27 / 41

Chadwick discovered neutrons in_____

1934

1925

1930

1932

28 / 41

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

Stable

Indivisible

Reactive

Divisible

29 / 41

Neil Bohr presented his model in_______

1918

1913

1926

1914

30 / 41

Electronic configuration of Boron is______

1s2, 2p1

1s2, 2s2, 2p1

1s2, 2s2

1s2, 2s1

31 / 41

Which isotope is used for diagnosis of goiter?

Cobalt-60

P-32

St-90

lodine-131

32 / 41

Who performed first experiment to split atom?

Soddy

Bohr

Rutherford

Newton

33 / 41

Deuterium is used to make________

Heavy Water

Light Water

Hard Water

Soft Water

34 / 41

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

1896

1893

1897

1895

35 / 41

The p subshell has_________

One Orbital

Two Orbitals

Three Orbitals

Four Orbitals

36 / 41

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

1830

1820

1840

1850

37 / 41

Quantum means_________

Variable energy

Minimum energy

Fixed energy

High energy

38 / 41

Plum pudding theory was put forward by_________

Crooks

Soddy

Thomson

Goldstein

39 / 41

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

Rutherford

Bohr

Chadwick

Goldstein

40 / 41

How many electrons can be accommodated in L-shell?

8

2

18

32

41 / 41

The isotope C-12 is present in abundance of_____________

96.9%

None of these

99.7%

97.6%

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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