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Q.

The order of melting point, boiling point and densities of halogens

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a

Gradually decreases from F₂ to I₂

b

Decreases from F₂ to Br₂ and then increases

c

Increases from F₂ to Br₂ and then decreases

d

Gradually increases from F₂ to I

answer is B.

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Detailed Solution

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The order of melting point, boiling point and densities of halogens due to increasing of atomic sizes.

atomic size increases vanderwaal forces increases, melting point, boiling point also increases.

density = mass / volume, sizes increases densities also increases.

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The order of melting point, boiling point and densities of halogens