Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Which one is polyatomic molecule?

C H4

All of these

H2 SO4

C6 H2 O6

2 / 50

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

0.21

0.24

0.15

0.18

3 / 50

The mass of one molecule of water is________

18g

18kg

18amu

18mg

4 / 50

Example of mono atomic molecule is___________

He

O2

H2

CO2

5 / 50

Empirical formula of sand is________

SiO4

SiO2

Si2O3

SiO3

6 / 50

Valency of oxygen is___________

2

4

5

3

7 / 50

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

Aluminum

Iron

Silicon

Oxygen

8 / 50

Which one is a physical property?

All of these

Smell

Taste

Hardness

9 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on micro scale

on commercial scale

in the laboratory

on economic scale

10 / 50

Which one of following is an example of ionic compound?

NaCl

HCl

CH4

H2O

11 / 50

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

32amu

1.92x10(-25)amu

192.64X10(-25)amu

53.12x10(-24)amu

12 / 50

80 percent elements are____________

Non-metals

None

Metalloids

Metals

13 / 50

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

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

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

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

1 mole of NaCl and 1 mole of MgCl2

14 / 50

Empirical formula of glucose is______

C H2 O

CHO2

CHO

C2 HO

15 / 50

Mass of 3 moles of oxygen atoms is ___________

48g

64g

32g

16g

16 / 50

Which one is extremely reactive species?

H2

Na

N2+

CH3

17 / 50

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

6.02x10(24)

6.02x10(23)

1.66x10(-24)

3.01x10(23)

18 / 50

Fourth state of matter is__________

Gas

Plasma

Solid

Liquid

19 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

CHO

C H2 O

CH

20 / 50

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

Nitrogen

Oxygen

Argon

Carbon monoxide

21 / 50

Which type of molecular ions are present in plasma?

Cationic

Both a & b

Neutral

Anionic

22 / 50

A piece of matter in pure form is termed as _________

Element

Matter

Substance

Mixture

23 / 50

The valency of Noble Gases is__________

Zero

Two

One

Three

24 / 50

One amu (atomic mass unit) is equivalent to_______

1.66.x10(-24)g

1.66 x 10(-23)g

1.66 x 10(-24) mg

1.66 x 10(-24)kg

25 / 50

Formation of which of the following is affected by light_________

Atom

Free Radical

Molecule

Ion

26 / 50

Structure of atom is studied in which branch of chemistry?

Inorganic

Physical

Organic

Nuclear

27 / 50

Brass is a mixture of___________

Cu & Zn

Cu & Al

Cu & Sn

Al & Fe

28 / 50

1-gram atom of carbon contains how many moles is_________

12mole

1mole

6 moles

2mole

29 / 50

Formula mass of K₂SO₄ is___________

110amu

174amu

145amu

180amu

30 / 50

Example of covalent compound is _________

KCl

NaCl

HCl

KNO3

31 / 50

Valency of carbon is___________

1

2

4

3

32 / 50

Mixture can be separated by method_________

Nuclear

All of these

Physical

Chemical

33 / 50

Elements may be_________

All of these

Gas

Liquid

Solid

34 / 50

Nuclear Chemistry has application in__________

Ecology

Agriculture

Metallurgy

Medical Treatment

35 / 50

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

Radical

Mixture

Compound

Element

36 / 50

40g of H₃PO₄ contains number of moles__________

0.58g

5.8g

0.408g

4.8g

37 / 50

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

Mass No

Electron No

Atomic No

Mass Unit

38 / 50

Which compound has same molecular and empirical formula?

C6 H12 O6

H2 O2

C6 H6

H2 O

39 / 50

Example of heterogeneous mixture is ___________

Air

Soil

ice cream

gasoline

40 / 50

The most abundant element occurring in the oceans is_______

Silicon

Hydrogen

Nitrogen

Oxygen

41 / 50

Value of Avogadro number is________

6.6x10(-20)

6.02x10(23)

6.00x10(24)

1.32x10(23)

42 / 50

Percentage of Argon in nature is____________

47%

0.9%

87%

21%

43 / 50

The molar mass of H₂S0₄ is__________

9.8amu

98g

9.8g

98amu

44 / 50

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

6.20 x 10(24)

6.2 x 10(-23)

6.02 x 10(23)

12.04 x 10(23)

45 / 50

Atom is electrically______

Neutral

Positive

Negative

None

46 / 50

1-gram formula of NaCl contains grams________

58.5g

100g

32g

49g

47 / 50

Which one of the following pairs has the same mass?

1 mole of O2 and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of CO2

48 / 50

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

1.66x10(-23)

6.02x10(24)

None of these

6.02x10(23)

49 / 50

Which of the followings are tri-atomic molecule except?

CO2

H2

H2O

O3

50 / 50

The ratio of carbon and oxygen in CO₂ ________

3:8

2:3

1:2

1:8

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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