Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Valency of carbon is___________

3

2

1

4

2 / 50

Structure of atom is studied in which branch of chemistry?

Organic

Physical

Inorganic

Nuclear

3 / 50

Elements may be_________

Solid

Liquid

All of these

Gas

4 / 50

Empirical formula of glucose is______

CHO

C2 HO

CHO2

C H2 O

5 / 50

The valency of Noble Gases is__________

One

Three

Two

Zero

6 / 50

Which one is a physical property?

Smell

Taste

All of these

Hardness

7 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

16g

32g

64g

8 / 50

Atom is electrically______

Neutral

None

Negative

Positive

9 / 50

80 percent elements are____________

Metals

None

Non-metals

Metalloids

10 / 50

Example of mono atomic molecule is___________

CO2

O2

H2

He

11 / 50

How many atoms are present in one-gram atomic mass of a substance?

None of these

6.02x10(24)

6.02x10(23)

1.66x10(-23)

12 / 50

How many atoms are present in one-gram atomic mass of a substance?

6.2 x 10(-23)

12.04 x 10(23)

6.02 x 10(23)

6.20 x 10(24)

13 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of CO2

14 / 50

Which one is polyatomic molecule?

All of these

C6 H2 O6

C H4

H2 SO4

15 / 50

Example of covalent compound is _________

NaCl

KNO3

HCl

KCl

16 / 50

40g of H₃PO₄ contains number of moles__________

5.8g

0.408g

0.58g

4.8g

17 / 50

Which of the followings are tri-atomic molecule except?

O3

H2O

CO2

H2

18 / 50

Value of Avogadro number is________

6.6x10(-20)

6.00x10(24)

1.32x10(23)

6.02x10(23)

19 / 50

Number of protons in the nucleus of an atom is called ________

Mass Unit

Electron No

Mass No

Atomic No

20 / 50

Nuclear Chemistry has application in__________

Agriculture

Ecology

Medical Treatment

Metallurgy

21 / 50

The molar mass of H₂S0₄ is__________

9.8amu

98amu

98g

9.8g

22 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66 x 10(-23)g

1.66.x10(-24)g

1.66 x 10(-24)kg

23 / 50

1-gram atom of carbon contains how many moles is_________

6 moles

2mole

1mole

12mole

24 / 50

1-gram formula of NaCl contains grams________

58.5g

32g

100g

49g

25 / 50

Percentage of Argon in nature is____________

21%

87%

0.9%

47%

26 / 50

In which one of the following pairs has the same number of ions?

1 mole of NaCl and 1 mole of MgCl2

1/3 mole of NaCl and 1/2 mole of MgCl2

1/2 mole of NaCl and 1/2 mole of MgCl2

1/2 mole of NaCl and 1/3 mole of MgCl2

27 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

in the laboratory

on economic scale

on commercial scale

28 / 50

Formula mass of K₂SO₄ is___________

110amu

180amu

174amu

145amu

29 / 50

Example of heterogeneous mixture is ___________

Air

ice cream

gasoline

Soil

30 / 50

How many number of moles are equivalent to 8 grams of CO₂?

0.21

0.18

0.15

0.24

31 / 50

The third abundant gas found in the earth's crust is_______

Nitrogen

Argon

Carbon monoxide

Oxygen

32 / 50

Which one of following is an example of ionic compound?

HCl

CH4

H2O

NaCl

33 / 50

Which one of the following is molar mass of O₂ in amu?

192.64X10(-25)amu

53.12x10(-24)amu

32amu

1.92x10(-25)amu

34 / 50

Which type of molecular ions are present in plasma?

Both a & b

Cationic

Anionic

Neutral

35 / 50

The most abundant element occurring in the oceans is_______

Silicon

Hydrogen

Oxygen

Nitrogen

36 / 50

How many molecules of water will be present in half mole of water?

6.02x10(23)

3.01x10(23)

1.66x10(-24)

6.02x10(24)

37 / 50

Empirical formula of sand is________

SiO4

Si2O3

SiO3

SiO2

38 / 50

A piece of matter in pure form is termed as _________

Matter

Mixture

Element

Substance

39 / 50

Brass is a mixture of___________

Al & Fe

Cu & Sn

Cu & Al

Cu & Zn

40 / 50

Fourth state of matter is__________

Liquid

Plasma

Solid

Gas

41 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

C H2 O

CHO

CH

None of these

42 / 50

The ratio of carbon and oxygen in CO₂ ________

1:2

1:8

3:8

2:3

43 / 50

Which one of the following elements is found in most abundance in the earth's crust?

Oxygen

Silicon

Aluminum

Iron

44 / 50

Mixture can be separated by method_________

Chemical

Nuclear

All of these

Physical

45 / 50

Valency of oxygen is___________

3

5

2

4

46 / 50

The mass of one molecule of water is________

18amu

18mg

18g

18kg

47 / 50

Which one is extremely reactive species?

N2+

H2

Na

CH3

48 / 50

Formation of which of the following is affected by light_________

Free Radical

Atom

Ion

Molecule

49 / 50

Which compound has same molecular and empirical formula?

H2 O

C6 H12 O6

C6 H6

H2 O2

50 / 50

Which one of the following can be separated by physical-means?

Radical

Compound

Element

Mixture

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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, chemistry class 9 chapter 1.

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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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