Atoms and Molecules One Mark Online Test

Atoms and Molecules One Mark Online Test (10th Standard Science)

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Which of the following has the smallest mass?

A.\(6.023 \\times 10^{23}\) atoms of He B.1 atom of He C.2 g of He D.1 mole atoms of He

Which of the following is a triatomic molecule?

A.Glucose B.Helium C.Carbon dioxide D.Hydrogen

The volume occupied by 4.4 g of \(CO_2\) at S.T.P is

A.22.4 litre B.2.24 litre C.0.24 litre D.0.1 litre

Mass of 1 mole of Nitrogen atom is

A.28 amu B.14 amu C.28 g D.14 g

Which of the following represents 1 amu?

A.Mass of a C - 12 atom B.Mass of a hydrogen atom C.1/12th of the mass of a C - 12 atom D.Mass of O - 16 atom

Which of the following statements is incorrect?

A.12 gram of C - 12 contains Avogadro's number of atoms. B.One mole of oxygen gas contains Avogadro's number of molecules. C.One mole of hydrogen gas contains Avogadro's number of atoms. D.One mole of electrons stands for \(6.023 \\times 10^{23}\) electrons.

The volume occupied by 1 mole of a diatomic gas at S.T.P is

A.11.2 litre B.5.6 litre C.22.4 litre D.44.8 litre

In the nucleus of \(_{20}Ca^{40}\), there are

A.20 protons and 40 neutrons B.20 protons and 20 neutrons C.20 protons and 40 electrons D.40 protons and 20 electrons

The gram molecular mass of oxygen molecule is

A.16 g B.18 g C.32 g D.17 g

Q10

1 mole of any substance contains ______________ molecules.

A.\(6.023 \\times 10^{23}\) B.\(6.023 \\times 10^{-23}\) C.\(3.0115 \\times 10^{23}\) D.\(12.046 \\times 10^{23}\)

Q11

Which of the following pairs of elements represents isobars according to modern atomic theory?

A.Chlorine-35 and Chlorine-37 B.Argon-40 and Calcium-40 C.Oxygen-16 and Oxygen-18 D.Protium and Deuterium

Q12

Which of the following compounds exhibits an atom ratio of carbon, hydrogen, and oxygen that cannot be simplified to a simple whole number ratio of 1:2:1?

A.Glucose B.Formaldehyde C.Sucrose D.Fructose

Q13

According to modern atomic theory, which equation explains that the mass of an atom can be converted into energy?

A.E = h\nu B.\(E = mc^2\) C.p = mv D.PV = nRT

Q14

In an atom, which subatomic particles have negligible mass compared to the others?

A.Protons B.Neutrons C.Electrons D.Both protons and neutrons

Q15

Naturally occurring Boron consists of B-10 (20% abundance) and B-11 (80% abundance). What is the calculated average atomic mass of Boron?

A.10.0 amu B.10.2 amu C.10.8 amu D.11.0 amu

Q16

Which of the following statements correctly represents the relationship between molecules and compounds?

A.All molecules are compounds, and all compounds are molecules. B.All compounds are molecules, but all molecules are not compounds. C.Molecules are made of similar atoms only, whereas compounds are made of different atoms. D.Compounds do not contain chemical bonds, but molecules do.

Q17

Based on the classification of molecules, which of the following is a heteroatomic triatomic molecule?

A.Ozone B.Carbon dioxide C.Ammonia D.Phosphorus

Q18

Oxygen exists in two allotropic forms: oxygen gas and ozone. What are their respective atomicities?

A.1 and 2 B.2 and 3 C.2 and 4 D.3 and 2

Q19

What is the SI unit of Relative Molecular Mass?

A.Grams B.Atomic mass units C.It has no unit D.Moles

Q20

What is the gram molecular mass of hydrogen chloride (HCl) gas?

A.18 g B.36.5 g C.44 g D.17 g

Q21

Which of the following statements represents a correct difference between atoms and molecules?

A.Atoms exist in a free state, while molecules do not. B.Molecules do not possess chemical bonds, while atoms do. C.Except for noble gases, atoms are highly reactive, while molecules are less reactive. D.Atom is the smallest particle of a compound, while molecule is the smallest particle of an element.

Q22

Which scientific hypothesis resolved the divisibility of atoms and molecules by showing that one molecule of hydrogen chloride gas is made of half a molecule of hydrogen and half a molecule of chlorine?

A.Dalton's Atomic Theory B.Gay-Lussac's Law C.Avogadro's Hypothesis D.Berzelius Hypothesis

Q23

How is the relative molecular mass of a gas mathematically related to its vapour density?

A.Relative Molecular Mass = Vapour Density / 2 B.Relative Molecular Mass = 2 \\(\times\) Vapour Density C.Relative Molecular Mass = Vapour Densit\(y^2\) D.Relative Molecular Mass = \\(\sqrt{Vapour Density}\)

Q24

According to the applications of Avogadro's law, what volume does one mole of any gas occupy at S.T.P.?

A.11.2 litres B.2.24 litres C.22.4 litres D.44.8 litres

Q25

What is the gram molecular mass of calcium phosphate, Ca3(PO4)2? (Atomic mass: Ca = 40, P = 31, O = 16)

A.310 g B.135 g C.200 g D.155 g

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About this Atoms and Molecules test

This free online practice test covers Atoms and Molecules from the 10th Standard Science (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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