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The outer surface of a beaker containing ice cubes becomes wet in short while - Give scientific reason.

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Question  The outer surface of a beaker containing ice cubes becomes wet in short while. Answer  When ice cubes are placed in a beaker, ice starts melting.  The heat required for melting is absorbed from the surrounding air and also from the beaker to some extent.  Hence, the temperature of the air and beaker falls.  The capacity of air to hold water vapour depends upon the temperature of the air, and this capacity decreases as the temperature decreases.  At a certain low temperature, the surrounding air becomes saturated with water vapour present in it.  As the temperature falls further, the air is unable to hold all the water vapour.  Hence, the extra water vapour starts condensing on the cold outer surface of the beaker in the form of minute drops.  Therefore, The outer surface of the beaker containing ice cubes becomes wet in a short while.
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Fluorine is the most reactive among the halogens.

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Question

Fluorine is the most reactive among the halogens.

Answer 

Fluorine has the electronic configuration 2, 7. 

It requires only one electron to complete the octet. 

The atomic size of fluorine is smallest among the halogens. Hence, the nuclear attraction on the outermost electrons is maximum.

Hence, Fluorine is the most reactive among the halogens.

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