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Chemistry Chapter 4 : Topic 12
Group VII Properties
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Which statement best defines Group VII (Halogens)?
Reasoning: Halogens are Group VII elements with 7 valence electrons and exist as diatomic molecules (e.g., Cl₂).
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Why are halogens called diatomic?
Reasoning: Halogens naturally exist as molecules containing two atoms (F₂, Cl₂, Br₂, I₂).
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Which is the correct physical state trend of halogens at room temperature?
Reasoning: Fluorine and chlorine are gases, bromine is liquid, iodine is solid.
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Which trend correctly describes halogens down the group?
Reasoning: Down the group atomic size increases → density increases, but reactivity decreases.
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Which halogen is most reactive?
Reasoning: Fluorine is at the top of Group VII and is most reactive.
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Which halogen has the highest density?
Reasoning: Density increases down the group, iodine is lowest.
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Why does reactivity of halogens decrease down the group?
Reasoning: Larger atomic size reduces attraction for gaining electrons.
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Which property is common to all halogens?
Reasoning: All halogens exist as diatomic non-metals.
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Which order shows correct increasing density of halogens?
Reasoning: Density increases down Group VII.
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Which halogen is a reddish-brown liquid at room temperature?
Reasoning: Bromine is the only liquid halogen at room temperature.
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Which statement correctly describes iodine?
Reasoning: Iodine is solid and least reactive among halogens.
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What happens to atomic size in Group VII?
Reasoning: Additional shells are added down the group.
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Which halogen is least reactive?
Reasoning: Reactivity decreases down the group.
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Which best explains why halogens are good oxidizing agents?
Reasoning: Halogens gain electrons to complete octet.
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Which trend is correct for halogens down the group?
Reasoning: Increasing size reduces reactivity but increases density.
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A student observes that chlorine is more reactive than bromine. The reason is:
Reasoning: Smaller atoms attract electrons more strongly.
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Which halogen is expected to displace iodine from its compound?
Reasoning: More reactive halogen displaces less reactive one.
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Which property supports that halogens are non-metals?
Reasoning: Non-metals gain electrons to form anions.
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Which statement is correct about fluorine?
Reasoning: Fluorine is at the top and most reactive.
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Why do halogens become less reactive down the group?
Reasoning: More inner shells reduce nuclear attraction.
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Which element has the greatest tendency to gain electrons?
Reasoning: Fluorine has strongest electronegativity.
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Which physical property increases from fluorine to iodine?
Reasoning: Heavier atoms have greater mass per volume.
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Which statement is TRUE about halogens?
Reasoning: Halogens are Group VII non-metals existing as X₂.
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Which halogen is expected to be the heaviest?
Reasoning: Iodine has the highest atomic mass among common halogens.
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Which trend correctly explains halogen behavior?
Reasoning: Smaller size increases attraction for electrons.
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