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

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

1 0 P

1 0 n

-1 0 e

4 2 He

2 / 41

Deuterium is used to make________

Hard Water

Heavy Water

Light Water

Soft Water

3 / 41

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

01

02

03

04

4 / 41

The isotope C-12 is present in abundance of_____________

96.9%

None of these

97.6%

99.7%

5 / 41

Electronic configuration of Boron is______

1s2, 2p1

1s2, 2s2

1s2, 2s2, 2p1

1s2, 2s1

6 / 41

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

1897

1896

1893

1895

7 / 41

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

Bohr

Goldstein

Rutherford

Chadwick

8 / 41

Who performed first experiment to split atom?

Soddy

Newton

Rutherford

Bohr

9 / 41

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

1840

1830

1850

1820

10 / 41

Quantum means_________

Variable energy

Fixed energy

High energy

Minimum energy

11 / 41

Which one of the following consists of three subshells?

M shell

L shell

N shell

O shell

12 / 41

Chadwick discovered neutrons in_____

1932

1930

1934

1925

13 / 41

¹³C and ¹⁴C are both present in nature_______

0.9 %

1.1 %

0.1 %

1.5 %

14 / 41

John Dalton put forward his atomic theory in the beginning of________

16th Century

18th Century

17th Century

19th Century

15 / 41

Which isotope is used for diagnosis of goiter?

St-90

P-32

Cobalt-60

lodine-131

16 / 41

According to Rutherford’s atomic theory atom should produce_________

Line Spectrum

None of These

Continuous Spectrum

Both A & B

17 / 41

The concept of orbit was used by____________

Rutherford

J.J. Thomson

Planck

Bohr

18 / 41

How many electrons can be accommodated in L-shell?

32

18

8

2

19 / 41

The p subshell has_________

Four Orbitals

Two Orbitals

Three Orbitals

One Orbital

20 / 41

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

Reactive

Divisible

Indivisible

Stable

21 / 41

⁹₄Be + ⁴₂He ----> ¹²₆C+ ?

4 2 He

-1 0 e

1 0 P

1 0 n

22 / 41

Neil Bohr won the noble prize in________

1926

1918

1922

1914

23 / 41

Symbol for Deuterium is ________

1 1 H

1 0 H

3 1 H

2 1 H

24 / 41

How many electrons can be accommodated in p-orbital?

2

10

6

14

25 / 41

How many electrons can be accommodated in N-shell?

32

2

8

18

26 / 41

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

Goldstein

Newton

Chadwick

Rutherford

27 / 41

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

0.002cm

0.0001cm

0.00004cm

0.001cm

28 / 41

Who discovered the proton?

Rutherford

Neil Bohr

J.J. Thomson

Gold stein

29 / 41

Rutherford won noble prize in __________

1908

1910

1902

1906

30 / 41

Which of the following results in the discovery of proton?

X-Rays

Canal Rays

Cathode Rays

Alpha Rays

31 / 41

Which one of the following is the most penetrating?

Protons

Neutrons

Alpha particles

Electrons

32 / 41

Plum pudding theory was put forward by_________

Goldstein

Soddy

Crooks

Thomson

33 / 41

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

3n2

2n2

2n

n2

34 / 41

Canal Rays were discovered by_________

Dalton

Crooks

Goldstein

Thomson

35 / 41

When U-235 breaks up, it produces_________

Electrons

Protons

Nothing

Neutrons

36 / 41

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

Iodine-131

Cobalt-60

Strontium-90

Phosphorous-30

37 / 41

The value of Planck’s constant is_______

6.62x10(-19) Js

6.62x10(-12)Js

6.63x10(-34) Js

6.62x10(-24) Js

38 / 41

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

Bohr

Rutherford

Both a & b

Chadwick

39 / 41

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

97 %

100 %

98 %

99 %

40 / 41

Neil Bohr presented his model in_______

1926

1918

1913

1914

41 / 41

In 1897, who found electrons in atom?

William Crooks

J.J. Thomson

Dalton

Goldstein

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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