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Chemistry Chapter 4 : Topic 18
Noble Gases
1 / 20
Which of the following statements best explains why Group 18 elements are chemically unreactive under normal conditions?
Reasoning: Noble gases already have a stable electronic configuration (duplet for He, octet for others), so they do not tend to gain, lose, or share electrons.
2 / 20
Which property of noble gases directly leads to their existence as monatomic gases rather than diatomic molecules?
Reasoning: Because their outer shells are complete, they do not form bonds with other atoms, so they exist as single atoms (monatomic).
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A student claims that noble gases do not form compounds because they have zero electron affinity. Which of the following best evaluates this claim?
Reasoning: Noble gases have very low electron affinity, meaning they rarely accept electrons, contributing to their inertness.
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Which of the following best describes the term “monatomic gas” in the context of noble gases?
Reasoning: Noble gases exist as individual atoms rather than molecules due to lack of bonding.
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Why is helium considered chemically inert despite having only two electrons in its outer shell?
Reasoning: Helium follows the duplet rule (2 electrons fill its shell), making it stable and unreactive.
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Which of the following properties is NOT characteristic of noble gases?
Reasoning: Noble gases are monatomic, not diatomic.
7 / 20
The lack of chemical reactivity in noble gases is mainly due to:
Reasoning: Stability due to complete valence shell prevents reactions.
8 / 20
Which noble gas would be expected to have the least tendency to form compounds?
Reasoning: Neon has a very stable configuration and high ionization energy, making it least reactive.
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Which statement correctly differentiates noble gases from other groups in the periodic table?
Reasoning: Complete outer shell is their defining feature.
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The term “inert gases” for noble gases is used because they:
Reasoning: They rarely react chemically, hence called inert.
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Which factor makes ionization of noble gases difficult?
Reasoning: High ionization energy means removing an electron requires a lot of energy.
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If noble gases were to form compounds, which condition would most likely enable this?
Reasoning: Heavier noble gases can react with very electronegative elements like fluorine.
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Which of the following explains why noble gases have very low boiling points?
Reasoning: Weak intermolecular forces make it easy for atoms to separate.
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What is the valency of noble gases under normal conditions?
Reasoning: They neither gain nor lose electrons, so valency is zero.
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Which statement best justifies placing noble gases in a separate group in the periodic table?
Reasoning: Their chemical inactivity makes them distinct.
16 / 20
Compared to other elements in the same period, noble gases have:
Reasoning: Strong nuclear attraction makes electron removal difficult.
17 / 20
Why do noble gases not form molecules like O₂ or N₂?
Reasoning: No unpaired electrons → no covalent bond formation.
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Which of the following statements is most accurate about noble gases?
Reasoning: Stability and monatomic nature define noble gases.
19 / 20
Which trend is observed down Group 18?
Reasoning: Heavier noble gases (like Xe) can form compounds more easily.
20 / 20
Which statement best explains why noble gases are used in inert environments (e.g., light bulbs)?
Reasoning: Their inertness prevents reactions like oxidation.
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