Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Elements may be_________

Gas

Solid

Liquid

All of these

2 / 50

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

12.04 x 10(23)

6.20 x 10(24)

6.2 x 10(-23)

6.02 x 10(23)

3 / 50

Which one is polyatomic molecule?

C H4

C6 H2 O6

H2 SO4

All of these

4 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

C H2 O

CHO

None of these

CH

5 / 50

Valency of oxygen is___________

5

2

3

4

6 / 50

Nuclear Chemistry has application in__________

Agriculture

Ecology

Medical Treatment

Metallurgy

7 / 50

Formula mass of K₂SO₄ is___________

110amu

180amu

174amu

145amu

8 / 50

1-gram formula of NaCl contains grams________

58.5g

49g

100g

32g

9 / 50

Example of mono atomic molecule is___________

O2

H2

He

CO2

10 / 50

Empirical formula of sand is________

Si2O3

SiO4

SiO2

SiO3

11 / 50

Which one of following is an example of ionic compound?

NaCl

CH4

HCl

H2O

12 / 50

The valency of Noble Gases is__________

Zero

Three

Two

One

13 / 50

Brass is a mixture of___________

Al & Fe

Cu & Sn

Cu & Al

Cu & Zn

14 / 50

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

192.64X10(-25)amu

1.92x10(-25)amu

53.12x10(-24)amu

32amu

15 / 50

The molar mass of H₂S0₄ is__________

98amu

98g

9.8g

9.8amu

16 / 50

Which type of molecular ions are present in plasma?

Anionic

Neutral

Cationic

Both a & b

17 / 50

Mixture can be separated by method_________

Chemical

Nuclear

All of these

Physical

18 / 50

Example of covalent compound is _________

KNO3

KCl

NaCl

HCl

19 / 50

A piece of matter in pure form is termed as _________

Element

Mixture

Matter

Substance

20 / 50

Percentage of Argon in nature is____________

21%

87%

0.9%

47%

21 / 50

Which one is extremely reactive species?

CH3

Na

N2+

H2

22 / 50

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

6.02x10(23)

3.01x10(23)

6.02x10(24)

1.66x10(-24)

23 / 50

80 percent elements are____________

Non-metals

None

Metalloids

Metals

24 / 50

Fourth state of matter is__________

Gas

Liquid

Plasma

Solid

25 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on economic scale

in the laboratory

on micro scale

on commercial scale

26 / 50

Example of heterogeneous mixture is ___________

Air

gasoline

ice cream

Soil

27 / 50

1-gram atom of carbon contains how many moles is_________

12mole

2mole

6 moles

1mole

28 / 50

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

Atomic No

Electron No

Mass Unit

Mass No

29 / 50

The ratio of carbon and oxygen in CO₂ ________

2:3

1:8

1:2

3:8

30 / 50

Formation of which of the following is affected by light_________

Molecule

Ion

Free Radical

Atom

31 / 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

32 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

48g

64g

32g

33 / 50

Empirical formula of glucose is______

CHO2

C H2 O

C2 HO

CHO

34 / 50

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

Nitrogen

Oxygen

Argon

Carbon monoxide

35 / 50

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

0.18

0.15

0.21

0.24

36 / 50

40g of H₃PO₄ contains number of moles__________

0.58g

5.8g

0.408g

4.8g

37 / 50

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

Element

Compound

Radical

Mixture

38 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66.x10(-24)g

1.66 x 10(-24)kg

1.66 x 10(-23)g

39 / 50

The mass of one molecule of water is________

18amu

18kg

18mg

18g

40 / 50

Which compound has same molecular and empirical formula?

C6 H6

C6 H12 O6

H2 O2

H2 O

41 / 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

42 / 50

Which one is a physical property?

Hardness

All of these

Smell

Taste

43 / 50

Valency of carbon is___________

2

1

3

4

44 / 50

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

Oxygen

Aluminum

Silicon

Iron

45 / 50

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

1.66x10(-23)

None of these

6.02x10(24)

6.02x10(23)

46 / 50

The most abundant element occurring in the oceans is_______

Oxygen

Nitrogen

Hydrogen

Silicon

47 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Nuclear

Inorganic

48 / 50

Which of the followings are tri-atomic molecule except?

H2

H2O

CO2

O3

49 / 50

Value of Avogadro number is________

6.6x10(-20)

6.02x10(23)

6.00x10(24)

1.32x10(23)

50 / 50

Atom is electrically______

Negative

Neutral

Positive

None

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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