Introduction to Fundamental Concepts of Chemistry

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Chemistry Introduction to Fundamental Concepts of Chemistry Chapter 1 Class 11

1 / 100

The bond formed when two or more atoms complete their electron shells by sharing electrons is called __________:

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Hints

A) Ionic bond

B) Hydrogen bond

C) Covalent bond

D) None of these options are correct

2 / 100

The efficiency of a chemical reactions can be checked by calculating ________ yield.

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Hints

A) Percentage

B) Actual

C) Theoretical

D) All of these options are correct

3 / 100

It is the fact that 22.414 cm3 of any gas has a different mass but the same number of:

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Hints

A) Atoms

B) Particles

C) Molecules

D) None of these

4 / 100

In mass spectrometer, detector or collector measures the:

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Hints

A) Masses of isotopes

B) Percentages of isotopes

C) Relative abundances of isotopes

D) Mass numbers of isotopes

5 / 100

11.2L of CO2 at STP corresponds to how many number of moles?

Elimination Tool
Hints

A) 0.5

B) 0.3

C) 0.2

D) 0.1

6 / 100

Spectrometry is used when reactants and products absorb _____.

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Hints

A) Ultraviolet radiations

B) Visible radiation

C) Infrared radiation

D) All of these

7 / 100

What is the mass in grams of 1.69 moles of phosphoric acid?

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Hints

A) 148g

B) 138g

C) 157g

D) 166g

8 / 100

The amount of reactant according to the balanced chemical equation is called as?

Elimination Tool
Hints

A) Excess amount

B) Actual amount

C) Limiting amount

D) Stoichiometric amount

9 / 100

A compound of sodium oxide has 74.2% of sodium and 25.8% of Oxygen. The empirical formula of the compound is?

Elimination Tool
Hints

A) Nao

B) NaO2

C) Na2O

D) Na2O2

10 / 100

The relative abundance of isotopes of elements are measured by?

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Hints

A) Atomic Spectroscopy

B) Ionic Spectroscopy

C) Mass Spectroscopy

D) Mass Spectrometry

11 / 100

How many molecules are there in 2.1 moles of CO2:

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Hints

A) 3.49 x 10⁻²⁴

B) 2.53 x 10²⁴

C) 1.26 x 10²⁴

D) 3.79 x 10²⁴

12 / 100

Glucose(C6H12O6) is the most important nutrient in a cell for generating chemical potential energy, what is the mass percent of carbon in 1.5g of sample?

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Hints

A) 33%

B) 40%

C) 53.3%

D) 6.67%

13 / 100

Chemical equations do not tell about the ________ because of certain limitations:

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Hints

A) Rate of reaction

B) Physical states of reactants and products.

C) Conditions

D) Both A & C

14 / 100

Atoms having same mass number but different atomic numbers are called?

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Hints

A) Isotopes

B) Isobars

C) Isotones

D) Isomers

15 / 100

What is the mass in grams of 1.69 moles of phosphoric acid?

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Hints

A) 148 g

B) 138 g

C) 157 g

D) 166 g

16 / 100

Many elements have fractional atomic masses. This is because:

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A) Mass of atom is itself reactional

B) Atomic masses are average masses of isobars

C) Atomic masses are average masses of isotopes

D) Atomic masses are average masses of isotopes proportional to their abundance

17 / 100

What is the mass of 2 dm3 of oxygen at S.T.P?

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Hints

A) 1.42g

B) 2.22g

C) 3.2g

D) 2.85g

18 / 100

Actual yield is always less than theoretical yield due to:

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Hints

A) Operational losses

B) Reaction reversibility

C) Side reaction

D) All of these

19 / 100

Find the mass in grams of 1.69 mol of phosphoric acid:

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Hints

A) 165.6 g

B) 157 g

C) 148 g

D) 138 g

20 / 100

A compound has an empirical formula CH2Cl and molecular formula mass as 99gmol-1, identify the compound:

Elimination Tool
Hints

A) C2H4Cl

B) C4H8Cl

C) C2H4Cl2

D) C2H3Cl3

21 / 100

30 grams of 2-propanol were mixed with excess acidified K2Cr2O7 and boiled under reflux for 20 minutes. The organic product was then collected by distillation. The yield of product was 75.0%. What is the mass of product produced?

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Hints

A) 1.74g

B) 21.75g

C) 2.74g

D) 29 g

22 / 100

Which of the following statement about Avogadro’s hypothesis is correct?

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Hints

A) Under similar conditions of temperature and pressure, gases react with each other in simple ratio.

B) Under similar conditions of temperature and pressure, equal volumes of all gases contain same number of molecules.

C) At NTP all gases contain same number of molecules.

D) Gases always react with gases only at given temperature and pressure.

23 / 100

Correct representation of element with atomic number and atomic mass is:

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Hints

A) Option A

B) Option B

C) Option C

D) Option D

24 / 100

A sample of 0.7 moles of metal ‘M’ reacts completely with an excess of fluorine to form 45 g of MF2. How many moles of F are present in it?

Elimination Tool
Hints

A) 1.4 moles

B) 2.4 moles

C) 2 moles

D) 1.2 moles

25 / 100

In stoichiometry, we follow law of ________ while doing calculations:

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Hints

A) Conservation of mass

B) Definite proportion

C) Both A and B

D) None of these

26 / 100

_______ is a macromolecule found in blood.

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Hints

A) Hemoglobin

B) Plasma

C) Creatinine

D) Plasmids

27 / 100

The unit used to express the relative atomic mass is called?

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Hints

A) Gram unit

B) Avogadro's number

C) Atomic mass

D) Atomic mass unit

28 / 100

Molecular ions are produced by passing a high-energy electron beam or an x-ray beam through:

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Hints

A) Atoms

B) Molecules

C) Gas

D) Solid

29 / 100

11.207 dm3 of methane at STP has ________ moles of hydrogen atoms:

Elimination Tool
Hints

A) 4

B) 2

C) 8

D) 16

30 / 100

During combustion analysis, which one is used for absorbing carbon dioxide?

Elimination Tool
Hints

A) 50% KOH solution

B) Mg(CLO4)2

C) 5% KOH

D) Silica gel

31 / 100

A compound of sodium oxide has 74.2% of sodium and 25.8% of Oxygen. The empirical formula of the compound is?

Elimination Tool
Hints

A) Nao

B) NaO2

C) Na2O

D) Na2O2

32 / 100

Formula mass is considered for ___________ compounds instead of their molecular mass:

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Hints

A) Metallic

B) Ionic

C) Covalent

D) Polar covalent

33 / 100

The number of moles of CO2 that contain 8g of oxygen is:

Elimination Tool
Hints

A) 0.75

B) 1.50

C) 0.25

D) 1.00

34 / 100

Choose the correct option regarding number of particles associated with one mole of a substance:

Elimination Tool
Hints

A) 6.03 x 10^23

B) 6.01 x 10^-19

C) 6.02 x 10^-23

D) 6.02 x 10^23

35 / 100

Mass of an atom ranges from?

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Hints

A) 1 x 10^-28 kg to 1 x 10^-22 kg

B) 1 x 10^-26 kg to 1 x 10^-23 kg

C) 1 x 10^-27 kg to 1 x 10^-24 kg

D) 1.6373 x 10^-27 kg to 1 x 10^-25 kg

36 / 100

Different kinds of atoms of the same element are called isotopes having different __________ but same ___________ properties.

Elimination Tool
Hints

A) Physical, atomic

B) Physical, chemical

C) Chemical, physical

D) Chemical, atomic

37 / 100

Mass of one mole of chlorine gas is?

Elimination Tool
Hints

A) 32g

B) 71g

C) 35.5g

D) 46g

38 / 100

The number of moles of CO2 that contain 8g of oxygen is:

Elimination Tool
Hints

A) 0.75

B) 1.50

C) 0.25

D) 1.00

39 / 100

Molecular ions are formed by passing:

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Hints

A) High energy electron beam

B) ∝-particle

C) X-rays

D) All of the above

40 / 100

Which one is not true about isotopes:

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Hints

A) Same number of neutrons

B) Same mass number

C) Same physical properties

D) All of these

41 / 100

Calculate the grams of H2O formed when 8g of CH4 burns in excess of oxygen:

Elimination Tool
Hints

A) 21 grams

B) 19 grams

C) 18 grams

D) 15 grams

42 / 100

The percentage of nitrogen in ammonium nitrate is:

Elimination Tool
Hints

A) 46%

B) 82%

C) 35%

D) 13%

43 / 100

The atomic mass, molecular mass, ionic mass or formula mass of a substance expressed in grams is called:

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Hints

A) Mole of a substance

B) Weight of substance

C) Mass of substance

D) Molar mass of substance

44 / 100

Limiting reactant controls the amount of ___________ ?

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Hints

A) Reactant

B) Products

C) Both A & B

D) None of these

45 / 100

The atoms of hemoglobin is heavier than H-atoms:

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Hints

A) 67,000 times

B) 68,000 times

C) 65,000 times

D) 69,000 times

46 / 100

The actual yield is always less than the theoretical yield due to:

Elimination Tool
Hints

A) Side reaction

B) Reversible nature

C) Mechanical loss

D) All of these

47 / 100

The relative atomic mass of oxygen is 16 amu. What is the mass of 2 moles of oxygen gas?

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Hints

A) 64g

B) 32g

C) 100g

D) 71g

48 / 100

Which one is the molar volume of a gas at STP?

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Hints

A) 24 dm3

B) 22414 cm3

C) 22.4 dm3

D) 0.22414 dm3

49 / 100

Avogadro’s constant is the number of:

Elimination Tool
Hints

A) Electrons present in 2g of H

B) Atoms in 24g of Mg

C) Atoms in 1g of He

D) Molecules in 35.5g of Chlorine

50 / 100

Which of the following have the same number of molecules?

Elimination Tool
Hints

A) 200 cm2 of Carbon dioxide and 500 cm2 of oxygen

B) 300 cm2 of Carbon dioxide and 150 cm2 of oxygen

C) 300 cm2 of Carbon dioxide and 150 cm2 of oxygen

D) 300 cm2 of Carbon dioxide and 300 cm2 of oxygen

51 / 100

The _____ study of composition of pure substance in 17th century clearly shows that few elements are components of many substances

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A) qualitative

B) quantitative

C) both A & B

D) extensive

52 / 100

Greater the number of moles, _________ will be the number of molecules.

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Hints

A) Lesser

B) Moderate

C) Greater

D) Equal

53 / 100

If we are given the mass of a substance ,we can calculate the _________ of the other substance with the help of a balanced chemical equation:

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Hints

A) Mass

B) Volume

C) Moles

D) All of these

54 / 100

The amount of reactant according to the balanced chemical equation is called as?

Elimination Tool
Hints

A) Excess amount

B) Actual amount

C) Limiting amount

D) Stoichiometric amount

55 / 100

The equivalent weight of iron in Fe2O3 would be:

Elimination Tool
Hints

A) 18.6

B) 28

C) 56

D) 112

56 / 100

The volume of 𝐶𝑂2 produced by heating 33.5𝑔 𝐿𝑖2𝐶𝑂3 at room temperature and pressure is (𝑀𝑟 𝐿𝑖2𝐶𝑂3 = 67𝑔/𝑚𝑜𝑙):

Elimination Tool
Hints

A) 22.4 𝑑𝑚3

B) 12.0 𝑑𝑚3

C) 11.2 𝑑𝑚3

D) 24.0 𝑑𝑚3

57 / 100

Avogadro’s hypothesis is applicable to _______ only.

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Hints

A) All gases

B) Inert gases

C) Ideal gases

D) Light gases

58 / 100

30 grams of 2-propanol were mixed with excess acidified K2Cr2O7 and boiled under reflux for 20 minutes. The organic product was then collected by distillation. The yield of product was 75.0%. What is the mass of product produced?

Elimination Tool
Hints

A) 1.74g

B) 21.75g

C) 2.74g

D) 29 g

59 / 100

If 9.8g of sulfuric acid is dissolved in excess quantity of water, it will yield ____ moles of hydrogen ion (H+) and _____ moles of sulphate ions (SO42-):

Elimination Tool
Hints

A) 0.1, 0.2

B) 0.1, 0.3

C) 0.2, 0.4

D) 0.2, 0.1

60 / 100

Identify the value of R at STP:

Elimination Tool
Hints

A) 8.324 atm dm-3 mol-1

B) 0.0821 cal K-1 mol-1

C) 0.0821 atm dm3 K-1 mol-1

D) 8.314 cal K-1 mol-1

61 / 100

Isotopes are?

Elimination Tool
Hints

A) Chemically similar

B) Physically dissimilar

C) Chemically dissimilar

D) Both Options A and B are correct

62 / 100

Identify the value of R at STP:

Elimination Tool
Hints

A) 8.324 atm dm-3 mol-1

B) 0.0821 cal K-1 mol-1

C) 0.0821 atm dm3 K-1 mol-1

D) 8.314 cal K-1 mol-1

63 / 100

The break down of molecular ions from natural products give important information about?

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Hints

A) Size

B) Position

C) Shape

D) Structure

64 / 100

Limiting reactant controls the amount of ___________ ?

Elimination Tool
Hints

A) Reactant

B) Products

C) Both A & B

D) None of these

65 / 100

Different kinds of atoms of the same element are called isotopes having different __________ but same ___________ properties.

Elimination Tool
Hints

A) Physical, atomic

B) Physical, chemical

C) Chemical, physical

D) Chemical, atomic

66 / 100

Which one is monoisotopic element?

Elimination Tool
Hints

A) Chlorine

B) Hydrogen

C) Flourine

D) Cadmium

67 / 100

If 9.8g of sulfuric acid is dissolved in excess quantity of water, it will yield _______ moles of hydrogen ion (H+) and _________ moles of sulphate ions (SO42-).

Elimination Tool
Hints

A) 0.1, 0.2

B) 0.1, 0.3

C) 0.2, 0.4

D) 0.2, 0.1

68 / 100

A mole of a substance contains _____ particles.

Elimination Tool
Hints

A) 6.2×10^22

B) 6.22×10^22

C) 6.02×10^23

D) 6.5×10^22

69 / 100

Correct representation of elements with atomic number and atomic mass is?

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A) A ZX

B) AXZ

C) ZAX

D) ZXA

70 / 100

The volume of 𝐶𝑂2 produced by heating 33.5𝑔 𝐿𝑖2𝐶𝑂3 at room temperature and pressure is (𝑀𝑟 𝐿𝑖2𝐶𝑂3 = 67𝑔/𝑚𝑜𝑙):

Elimination Tool
Hints

A) 22.4 𝑑𝑚3

B) 12.0 𝑑𝑚3

C) 11.2 𝑑𝑚3

D) 24.0 𝑑𝑚3

71 / 100

What is the mass of 2 dm3 of oxygen at S.T.P?

Elimination Tool
Hints

A) 1.42 g

B) 2.22 g

C) 3.2 g

D) 2.85 g

72 / 100

The calculation of the efficiency of a chemical reaction can be checked by knowing the amount of:

A) The limiting reactant

B) The access reagent

C) The product formed

D) The substance left unused

73 / 100

Which of the following is not true for a mole?

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Hints

A) It is counting unit

B) It is the gram atomic or gram formulae mass of a substance

C) It contains 6.023 x 1023 particles

D) It contains different number of particles for different substances

74 / 100

X-ray work in 20th century shows that diameter of the atoms are of the order:

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Hints

A) 1nm

B) 0.2nm

C) 3nm

D) 4nm

75 / 100

Which of the following has six isotopes?

Elimination Tool
Hints

A) Manganese

B) Tin

C) Calcium

D) Carbon

76 / 100

Avogadro’s constant is the number of:

Elimination Tool
Hints

A) Electrons present in 2g of H

B) Atoms in 24g of Mg

C) Atoms in 1g of He

D) Molecules in 35.5g of Chlorine

77 / 100

In which of the following will water evaporate earlier?

Elimination Tool
Hints

A) Cup

B) Saucepan

C) Glass

D) Small bowl

78 / 100

In the gaseous state, the distance between the molecules is ___________ than their diameters:

Elimination Tool
Hints

A) 200 times lesser

B) 300 times less

C) 300 times greater

D) 200 times greater

79 / 100

The number of moles of CO2 which contains 16g of oxygen:

Elimination Tool
Hints

A) 0.25

B) 1.00

C) 0.50

D) 1.50

80 / 100

The total number of neutrons in 5g of H2O are:

1 NA = 6.023 x 1023

Elimination Tool
Hints

A) 25 NA

B) 1.1 NA

C) 2.5 NA

D) 0.5 NA

81 / 100

Which one is the molar volume of the gas at STP?

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A) 24 dm3

B) 22.4 dm3

C) 80 dm3

D) 40 dm3

82 / 100

The volume occupied by 4.4g of CO2 at STP is?

Elimination Tool

A) 2.24 dm3

B) 112 cm3

C) 22.4 dm3

D) 1.12 dm3

83 / 100

The mass of 𝑁𝑎𝑂𝐻 needed to prepare 0.2 molal solution in 500𝑔 pure water at 4℃ is:

Elimination Tool
Hints

A) 0.4𝑔

B) 4.0𝑔

C) 1.5𝑔

D) 1.0𝑔

84 / 100

Isotopes are?

Elimination Tool
Hints

A) Chemically similar

B) Physically dissimilar

C) Chemically dissimilar

D) Both Options A and B are correct

85 / 100

2 moles of octane (C8H18) burn with 25 moles of oxygen (O2) and produced ___________ moles of carbon dioxide along with 18 moles of water.

Elimination Tool
Hints

A) 14

B) 16

C) 18

D) 2

86 / 100

The total number of neutrons in 5g of H2O are:

1 NA = 6.023 x 10^23

Elimination Tool
Hints

A) 25 NA

B) 1.1 NA

C) 2.5 NA

D) 0.5 NA

87 / 100

Which of the following contains 1 mole of the stated particles?

Elimination Tool
Hints

A) Chlorine molecules in 35.5g of chlorine gas

B) Electrons in 1g of Hydrogen gas

C) Hydrogen ions in 1 dm3 of 1 moldm-3 aqueous sulphuric acid

D) Oxygen atoms in 22.4 dm3of oxygen gas at STP

88 / 100

Number of neutrons in 6630Zn is:

Elimination Tool
Hints

A) 30

B) 35

C) 38

D) 36

89 / 100

Choose the correct option regarding number or particles associated with one mole of a substance:

Elimination Tool
Hints

A) 6.03 x 1023

B) 6.01 x 10-19

C) 6.02 x 10-23

D) 6.02 x 1023

90 / 100

Which of the following have the same number of molecules?

Elimination Tool
Hints

A) 200 cm2 of Carbon dioxide and 500 cm2 of oxygen

B) 300 cm2 of Carbon dioxide and 150 cm2 of oxygen

C) 300 cm2 of Carbon dioxide and 150 cm2 of oxygen

D) 300 cm2 of Carbon dioxide and 300 cm2 of oxygen

91 / 100

Natural gas in homes burns in excess of oxygen, what is the limiting reactant in this case?

Elimination Tool
Hints

A) Oxygen

B) Natural gas

C) Air

D) There is no limiting reactant

92 / 100

What mass of NaOH is present in 0.5 mol of sodium hydroxide?

Elimination Tool
Hints

A) 40 g

B) 2.5 g

C) 5 g

D) 20 g

93 / 100

Which of the following has six isotopes?

Elimination Tool
Hints

A) Cadmium

B) Tin

C) Palladium

D) Carbon

94 / 100

The negative ions having group of atoms is/are:

Elimination Tool
Hints

A) OH-

B) CO32-

C) Cr2O72-

D) All of these

95 / 100

The number of neutrons in H2SO4 are ________:

Elimination Tool
Hints

A) 5

B) 49

C) 48

D) 44

96 / 100

27g of Al will react with how much mass of O2 to produce Al2O3?

Elimination Tool
Hints

A) 8g of oxygen

B) 16g of oxygen

C) 32g of oxygen

D) 24g of oxygen

97 / 100

The amount of product according to the balanced chemical equation is called as?

Elimination Tool
Hints

A) Theoretical yield

B) Actual amount

C) Limiting amount

D) Stoichiometric amount

98 / 100

The empirical formula of the compound was found to be 𝐶𝐻2𝑂. If the molar mass of the compound is 150𝑔/𝑚𝑜𝑙. The molecular formula of the compound is:

Elimination Tool
Hints

A) 𝐶6𝐻12𝑂6

B) 𝐶4𝐻8𝑂2

C) 𝐶5𝐻10𝑂4

D) 𝐶5𝐻10𝑂5

99 / 100

Determine the number of moles of O in 10.6g of Na2CO3:

Elimination Tool
Hints

A) 0.4 moles

B) 0.3 moles

C) 0.2 moles

D) None of the given options

100 / 100

A sample of 0.7 moles of metal ‘M’ reacts completely with an excess of fluorine to form 45g of MF2. How many moles of F are present in it?

Elimination Tool
Hints

A) 1.4 moles

B) 2.4 moles

C) 2 moles

D) 1.2 moles

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Introduction to Fundamental Concepts of Chemistry

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