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Structure of molecules
6 Class 9 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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A bond formed by the transfer of electrons is called:
- 1 Covalent
- 2 Metallic
- 3 Ionic
- 4 Hydrogen
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Correct answer: Ionic
An ionic bond forms when electrons move from one atom to another.
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A bond formed by sharing of electrons is called:
- 1 Covalent
- 2 Ionic
- 3 Dative only
- 4 Electrovalent
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Correct answer: Covalent
Sharing of electron pairs gives a covalent bond.
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Which of these is an ionic compound?
- 1 Water
- 2 Methane
- 3 Carbon dioxide
- 4 Sodium chloride
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Correct answer: Sodium chloride
Sodium chloride is formed from Na+ and Cl- ions.
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How many electrons are shared in the double bond of O2?
- 1 6
- 2 1
- 3 2
- 4 4
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Correct answer: 4
A double bond is two shared pairs, so 4 electrons are shared.
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Ionic compounds usually have:
- 1 Gas state at room temperature
- 2 High melting points
- 3 Low melting points
- 4 No melting point
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Correct answer: High melting points
Strong attraction between ions gives high melting and boiling points.
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A compound that conducts electricity when molten is most likely:
- 1 A noble gas
- 2 Ionic
- 3 A non-polar liquid
- 4 Covalent
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Correct answer: Ionic
Molten ionic compounds have free moving ions that carry current.