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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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Zero group element (inert gases) are called noble gases

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Question

Zero group element (inert gases) are called noble gases. Give scientific reason.

Answer 

In the atoms of the inert gas element (zero group elements), all the electronic shells, including the outermost shell, are completely filled.


The electronic configuration is stable, and these elements do not lose or accept electrons. 

These elements do not take part in chemical reaction.

These elements are gases. hence, they are called noble gases.

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