Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Brass is a mixture of___________

Cu & Sn

Al & Fe

Cu & Al

Cu & Zn

2 / 50

1-gram formula of NaCl contains grams________

58.5g

100g

49g

32g

3 / 50

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

1.66x10(-23)

6.02x10(24)

6.02x10(23)

None of these

4 / 50

Value of Avogadro number is________

1.32x10(23)

6.02x10(23)

6.00x10(24)

6.6x10(-20)

5 / 50

Mixture can be separated by method_________

Nuclear

All of these

Physical

Chemical

6 / 50

Atom is electrically______

None

Neutral

Positive

Negative

7 / 50

Example of mono atomic molecule is___________

CO2

O2

H2

He

8 / 50

Elements may be_________

Solid

Gas

Liquid

All of these

9 / 50

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

1.92x10(-25)amu

53.12x10(-24)amu

192.64X10(-25)amu

32amu

10 / 50

Valency of carbon is___________

3

1

2

4

11 / 50

Which one of the following pairs has the same mass?

1 mole of O2 and 1 mole of N2

1 mole of CO and 1 mole of CO2

1 mole of CO and 1 mole of N2

1 mole of O2 and 1 mole of CO2

12 / 50

Nuclear Chemistry has application in__________

Agriculture

Ecology

Medical Treatment

Metallurgy

13 / 50

Example of covalent compound is _________

KCl

NaCl

HCl

KNO3

14 / 50

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

Mass Unit

Mass No

Electron No

Atomic No

15 / 50

Which one of following is an example of ionic compound?

NaCl

H2O

CH4

HCl

16 / 50

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

Aluminum

Silicon

Oxygen

Iron

17 / 50

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

Element

Compound

Mixture

Radical

18 / 50

The molar mass of H₂S0₄ is__________

98g

9.8amu

98amu

9.8g

19 / 50

Formation of which of the following is affected by light_________

Ion

Free Radical

Atom

Molecule

20 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on commercial scale

on economic scale

in the laboratory

on micro scale

21 / 50

The ratio of carbon and oxygen in CO₂ ________

2:3

1:8

3:8

1:2

22 / 50

Percentage of Argon in nature is____________

0.9%

47%

21%

87%

23 / 50

Example of heterogeneous mixture is ___________

Soil

Air

ice cream

gasoline

24 / 50

The most abundant element occurring in the oceans is_______

Hydrogen

Oxygen

Nitrogen

Silicon

25 / 50

Which one is polyatomic molecule?

All of these

C H4

C6 H2 O6

H2 SO4

26 / 50

Which one is a physical property?

Smell

Hardness

All of these

Taste

27 / 50

Which type of molecular ions are present in plasma?

Both a & b

Neutral

Cationic

Anionic

28 / 50

1-gram atom of carbon contains how many moles is_________

12mole

1mole

2mole

6 moles

29 / 50

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

Carbon monoxide

Oxygen

Argon

Nitrogen

30 / 50

Mass of 3 moles of oxygen atoms is ___________

32g

16g

48g

64g

31 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

None of these

C H2 O

CHO

CH

32 / 50

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

6.2 x 10(-23)

6.02 x 10(23)

6.20 x 10(24)

12.04 x 10(23)

33 / 50

Which of the followings are tri-atomic molecule except?

H2

H2O

CO2

O3

34 / 50

Fourth state of matter is__________

Plasma

Solid

Liquid

Gas

35 / 50

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

0.15

0.18

0.24

0.21

36 / 50

Structure of atom is studied in which branch of chemistry?

Organic

Nuclear

Inorganic

Physical

37 / 50

40g of H₃PO₄ contains number of moles__________

0.408g

5.8g

0.58g

4.8g

38 / 50

80 percent elements are____________

None

Non-metals

Metalloids

Metals

39 / 50

Which one is extremely reactive species?

H2

N2+

Na

CH3

40 / 50

Empirical formula of sand is________

SiO4

SiO3

Si2O3

SiO2

41 / 50

The mass of one molecule of water is________

18kg

18g

18mg

18amu

42 / 50

A piece of matter in pure form is termed as _________

Mixture

Matter

Element

Substance

43 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-23)g

1.66 x 10(-24) mg

1.66.x10(-24)g

1.66 x 10(-24)kg

44 / 50

Formula mass of K₂SO₄ is___________

145amu

180amu

110amu

174amu

45 / 50

Valency of oxygen is___________

3

5

2

4

46 / 50

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

1.66x10(-24)

6.02x10(23)

3.01x10(23)

6.02x10(24)

47 / 50

Which compound has same molecular and empirical formula?

C6 H12 O6

H2 O2

C6 H6

H2 O

48 / 50

The valency of Noble Gases is__________

Three

Zero

One

Two

49 / 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

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

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

1 mole of NaCl and 1 mole of MgCl2

50 / 50

Empirical formula of glucose is______

C H2 O

CHO

CHO2

C2 HO

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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