Q$4.$ Consider a simple isomorphous binary phase diagram of the system A$-$B in which, both the solid and liquid phases behave according to the ideal solution model.

$4+2+2=8$

$($a$)$ Draw neat schematic G vs$.$ x plots at $5$ different representative temperatures $($namely$,$ at $($i$)T_1>T_B,($ii$)T_2=T_B,($iii$)T_B>T_3>T_A,($iv$)T_4=T_A$ and $($v$)Txx40at\%BT66\mathrm{.}66\%\%33\mathrm{.}33\%T{T}_5$ i