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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