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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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It takes time for pieces of Shahabad tile to disappear in HCL, but it's powder disappear rapidly - Give scientific reason

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Question

It takes time for pieces of Shahabad tile to disappear in HCL, but it's powder disappear rapidly

Answer

The rate of the reaction depends upon the size of the particles of the reactants taking part in the reaction. The smaller the size of the reactants particles, the more is their total surface area and the faster is the rate of reaction.
In the reaction of dil. HCL with prices of Shahabad tile disappear slowly. On the other hand, CO2 effervescence forms at faster rate with Shahabad tile powder and it disappear rapidly.




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