The phase diagram for a substance is shown. Proceeding from points 1 to 2 to 3,
ID: 1072959 • Letter: T
Question
The phase diagram for a substance is shown. Proceeding from points 1 to 2 to 3, the substance undergoes the processes of and respectively. condensation, fusion sublimation, fusion freezing, vaporization vaporization, deposition The enthalpy of vaporization for a substance is significantly larger than the enthalpy of fusion because the vapor occupies more volume than the liquid to form a vapor, all intermolecular forces must be overcome. temperature remains constant during vaporization but not during melting. vapor pressure decreases and boiling point as vaporization occurs.Explanation / Answer
50) We know 3 is Solid, 1 is Liquid while 2 is Vapor phase. So 1 to 2 is nothing but liquid to vapor that means vaporization. 2 to 3 is vapor to solid which is deposition hence
Ans D
51) We know in liquid the molecules are stabilized by the interaction with other nearby molecules so liquid has small heat of fusion. In case of gas, it has bery little intermolecular stabilization so they have large heat of vaporization. So in order to vaporize the liquid we have to overcome all the intermolecular forces which requires greater energy. Hence we can safely say that answer has to be B
Ans: B
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