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

According to Rutherford’s atomic theory atom should produce_________

None of These

Line Spectrum

Continuous Spectrum

Both A & B

2 / 41

How many electrons can be accommodated in N-shell?

2

18

32

8

3 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

1 0 P

1 0 n

-1 0 e

4 / 41

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

1897

1896

1895

1893

5 / 41

How many electrons can be accommodated in L-shell?

32

8

18

2

6 / 41

Deuterium is used to make________

Soft Water

Heavy Water

Hard Water

Light Water

7 / 41

The concept of orbit was used by____________

Rutherford

Bohr

Planck

J.J. Thomson

8 / 41

Canal Rays were discovered by_________

Crooks

Dalton

Goldstein

Thomson

9 / 41

Chadwick discovered neutrons in_____

1932

1934

1925

1930

10 / 41

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

0.001cm

0.002cm

0.0001cm

0.00004cm

11 / 41

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

Chadwick

Newton

Goldstein

Rutherford

12 / 41

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

Chadwick

Bohr

Both a & b

Rutherford

13 / 41

When U-235 breaks up, it produces_________

Nothing

Electrons

Neutrons

Protons

14 / 41

Neil Bohr presented his model in_______

1918

1926

1914

1913

15 / 41

Which one of the following consists of three subshells?

O shell

L shell

N shell

M shell

16 / 41

Who discovered the proton?

Neil Bohr

J.J. Thomson

Gold stein

Rutherford

17 / 41

Symbol for Deuterium is ________

3 1 H

1 0 H

1 1 H

2 1 H

18 / 41

The isotope C-12 is present in abundance of_____________

99.7%

None of these

97.6%

96.9%

19 / 41

Neil Bohr won the noble prize in________

1926

1922

1914

1918

20 / 41

The p subshell has_________

One Orbital

Two Orbitals

Four Orbitals

Three Orbitals

21 / 41

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

04

02

01

03

22 / 41

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

Divisible

Stable

Indivisible

Reactive

23 / 41

In 1897, who found electrons in atom?

J.J. Thomson

William Crooks

Goldstein

Dalton

24 / 41

¹³C and ¹⁴C are both present in nature_______

0.1 %

1.1 %

1.5 %

0.9 %

25 / 41

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

1820

1840

1850

1830

26 / 41

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

Iodine-131

Cobalt-60

Phosphorous-30

Strontium-90

27 / 41

Rutherford won noble prize in __________

1902

1910

1906

1908

28 / 41

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

2n2

2n

3n2

n2

29 / 41

Who performed first experiment to split atom?

Bohr

Newton

Rutherford

Soddy

30 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

-1 0 e

1 0 n

1 0 P

4 2 He

31 / 41

John Dalton put forward his atomic theory in the beginning of________

16th Century

17th Century

19th Century

18th Century

32 / 41

How many electrons can be accommodated in p-orbital?

14

6

2

10

33 / 41

Electronic configuration of Boron is______

1s2, 2s1

1s2, 2s2, 2p1

1s2, 2s2

1s2, 2p1

34 / 41

Which of the following results in the discovery of proton?

X-Rays

Cathode Rays

Alpha Rays

Canal Rays

35 / 41

The value of Planck’s constant is_______

6.63x10(-34) Js

6.62x10(-24) Js

6.62x10(-12)Js

6.62x10(-19) Js

36 / 41

Which isotope is used for diagnosis of goiter?

P-32

Cobalt-60

lodine-131

St-90

37 / 41

Which one of the following is the most penetrating?

Neutrons

Protons

Electrons

Alpha particles

38 / 41

Plum pudding theory was put forward by_________

Goldstein

Thomson

Crooks

Soddy

39 / 41

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

Rutherford

Bohr

Goldstein

Chadwick

40 / 41

Quantum means_________

High energy

Variable energy

Fixed energy

Minimum energy

41 / 41

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

99 %

98 %

97 %

100 %

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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