Atoms and Molecules Additional One Mark Online Test

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

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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

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

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

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

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

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

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.

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

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

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

What is the SI unit of Relative Molecular Mass?

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

Q10

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

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

Q11

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.

Q12

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

Q13

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}\)

Q14

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

Q15

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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