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Q.

On decreasing the pressure, solid carbon dioxide is converted to which state?

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a

Solid

b

liquid

c

Gas

d

Plasma

answer is C.

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Detailed Solution

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Solid carbon dioxide gets converted directly to a gaseous state on the decrease of pressure to 1 atmosphere without coming into a liquid state. This is the reason why solid carbon dioxide is also known as dry ice. 

Thus we call this process sublimation. It is the conversion of a solid to a gaseous state without entering into liquid state

Hence option C is correct.

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