Fundamentals of Chemistry:

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Chemistry Ch#01, 9th Class

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1 / 50

Empirical formula of glucose is______

C H2 O

C2 HO

CHO2

CHO

2 / 50

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

3.01x10(23)

6.02x10(23)

1.66x10(-24)

6.02x10(24)

3 / 50

Empirical formula of sand is________

SiO3

Si2O3

SiO2

SiO4

4 / 50

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

Oxygen

Iron

Aluminum

Silicon

5 / 50

Which one is a physical property?

All of these

Hardness

Smell

Taste

6 / 50

Which one is polyatomic molecule?

All of these

H2 SO4

C6 H2 O6

C H4

7 / 50

Industrial chemistry deals with the Manufacturing of compounds_________

on commercial scale

in the laboratory

on economic scale

on micro scale

8 / 50

Elements may be_________

Solid

Liquid

Gas

All of these

9 / 50

Which type of molecular ions are present in plasma?

Neutral

Both a & b

Cationic

Anionic

10 / 50

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

6.02x10(24)

None of these

1.66x10(-23)

6.02x10(23)

11 / 50

Atom is electrically______

Positive

None

Neutral

Negative

12 / 50

40g of H₃PO₄ contains number of moles__________

4.8g

0.408g

0.58g

5.8g

13 / 50

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

12.04 x 10(23)

6.2 x 10(-23)

6.20 x 10(24)

6.02 x 10(23)

14 / 50

Which one is extremely reactive species?

H2

CH3

Na

N2+

15 / 50

Fourth state of matter is__________

Solid

Liquid

Plasma

Gas

16 / 50

Which one of the following pairs has the same mass?

1 mole of CO and 1 mole of CO2

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 N2

17 / 50

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

Compound

Radical

Mixture

Element

18 / 50

Mixture can be separated by method_________

Nuclear

Chemical

All of these

Physical

19 / 50

A piece of matter in pure form is termed as _________

Matter

Mixture

Element

Substance

20 / 50

Value of Avogadro number is________

1.32x10(23)

6.00x10(24)

6.02x10(23)

6.6x10(-20)

21 / 50

Brass is a mixture of___________

Cu & Sn

Cu & Zn

Cu & Al

Al & Fe

22 / 50

Mass of 3 moles of oxygen atoms is ___________

16g

32g

64g

48g

23 / 50

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

Nitrogen

Carbon monoxide

Oxygen

Argon

24 / 50

Example of heterogeneous mixture is ___________

gasoline

Soil

Air

ice cream

25 / 50

The mass of one molecule of water is________

18kg

18mg

18amu

18g

26 / 50

The most abundant element occurring in the oceans is_______

Nitrogen

Oxygen

Silicon

Hydrogen

27 / 50

Formation of which of the following is affected by light_________

Molecule

Atom

Free Radical

Ion

28 / 50

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

Electron No

Mass Unit

Mass No

Atomic No

29 / 50

Which one of following is an example of ionic compound?

NaCl

CH4

H2O

HCl

30 / 50

The valency of Noble Gases is__________

Three

Zero

Two

One

31 / 50

The ratio of carbon and oxygen in CO₂ ________

1:8

2:3

1:2

3:8

32 / 50

Valency of carbon is___________

4

2

3

1

33 / 50

Example of covalent compound is _________

KNO3

HCl

KCl

NaCl

34 / 50

80 percent elements are____________

Non-metals

Metals

Metalloids

None

35 / 50

Percentage of Argon in nature is____________

0.9%

87%

47%

21%

36 / 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

37 / 50

The molar mass of H₂S0₄ is__________

9.8g

98amu

9.8amu

98g

38 / 50

Which compound has same molecular and empirical formula?

C6 H6

H2 O2

C6 H12 O6

H2 O

39 / 50

One amu (atomic mass unit) is equivalent to_______

1.66 x 10(-24) mg

1.66 x 10(-24)kg

1.66.x10(-24)g

1.66 x 10(-23)g

40 / 50

Example of mono atomic molecule is___________

H2

O2

CO2

He

41 / 50

Structure of atom is studied in which branch of chemistry?

Physical

Organic

Nuclear

Inorganic

42 / 50

1-gram atom of carbon contains how many moles is_________

12mole

1mole

2mole

6 moles

43 / 50

1-gram formula of NaCl contains grams________

58.5g

49g

32g

100g

44 / 50

Nuclear Chemistry has application in__________

Medical Treatment

Ecology

Metallurgy

Agriculture

45 / 50

Which of the followings are tri-atomic molecule except?

CO2

O3

H2O

H2

46 / 50

Formula mass of K₂SO₄ is___________

110amu

180amu

174amu

145amu

47 / 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

48 / 50

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

0.21

0.15

0.18

0.24

49 / 50

Valency of oxygen is___________

4

3

5

2

50 / 50

Empirical formula of acetic acid (CH₃COOH) is _________

CHO

CH

None of these

C H2 O

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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