atoms and molecules class 9 mcq with answers
Choose the odd molecule
1) Argon molecule
2) Chlorine molecule
3) Oxygen molecule
4) Fluorine molecule
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When the particles of a substance contain only one type of atoms, the substance is called
1) Element
2) Compound
3) Molecule
4) None
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Matter consists of indivisible particles called
1) Molecules
2) Compounds
3) Elements
4) Atoms
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Argon is
1) monoatomic
2) diatomic
3) triatomic
4) polyatomic
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Molecules of the following element are made up of only one atom of that element
1) Iron
2) Sodium
3) Helium
4) Chlorine
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Which of the following does not change when a chemical reaction takes place
1) Volume
2) Mass
3) physical properties
4) chemical properties
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Greek name for sun is
1) Hydro
2) Oxy
3) Helio
4) Helios
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The symbol for the element chromium is
1) Cr
2) Cl
3) C
4) Ca
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Which of the following is mono atomic
1) Hydrogen
2) Ozone
3) Nitrogen
4) Helium
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The number of atoms constituting a molecule is known as its
1) Valency
2) Combining power
3) Atomicity
4) none
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