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Question
Assertion :Hoar frost is reverse of sublimation. Reason: Formation of snow by freezing of clouds or vapours is called Hoar frost, i.e., to reduce pressure over ice so that its external pressure becomes equal to vapour pressure.
Assertion :Hoar frost is reverse of sublimation. Reason: Formation of snow by freezing of clouds or vapours is called Hoar frost, i.e., to reduce pressure over ice so that its external pressure becomes equal to vapour pressure.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Option (A) is correct.
Hoar frost, deposit of ice crystals on objects exposed to the free air, such as grass blades, tree branches, or leaves. It is formed by direct condensation of water vapour to ice at temperatures below freezing and occurs when air is brought to its frost point by cooling.
The reverse process, sublimation, is when a solid changes directly to a gas.
Option (A) is correct.
Hoar frost, deposit of ice crystals on objects exposed to the free air, such as grass blades, tree branches, or leaves. It is formed by direct condensation of water vapour to ice at temperatures below freezing and occurs when air is brought to its frost point by cooling.
The reverse process, sublimation, is when a solid changes directly to a gas.
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