which solids will melt under applied pressure? Check all that apply.
Concepts and reason
Enthalpy of fusion is defined as the energy absorbed by a compound to overcome the intermolecular forces, to undergo the phase change from solid to liquid.
Enthalpy of fusion is also called as heat of fusion.
The melting point of a substance is measured at one atmospheric pressure. For applied pressure, the feasibility of melting of solid can be predicted by comparing with the triple point.
Fundamentals
Melting point: The temperature at which a compound in solid state changes into a liquid is known as melting point.
Triple point: The temperature at which solid, liquid, and gas exist is known as triple point.
Clausius-Clapeyron Equation:
his equation is applied for the systems that undergoes phase transitions
and used to identify the heat of fusion during phase change.
Answer:
The values of temperature and pressure at triple point and the melting point is given. On substituting, this in Clausius-Clapeyron equation, the magnitude of enthalpy of fusion 
is calculated.
The values of temperature and pressure at triple point and the melting point of solid is given. On substituting, this value in the Clausius-Clapeyron equation, the magnitude of enthalpy of fusion is calculated.
The enthalpy of fusion of solid A is lesser than solid B and C. Hence the solid A melts under applied pressure.
The solid that will melt under applied pressure is given below:
With the increase in pressure, at constant temperature the solid melts into a liquid. The triple point temperature of solid A is greater than its melting point temperature. Therefore, the solid A melts at applied pressure.