Question

At a given temperature, total vapour pressure in torr of
a mixture of volatile components A and B is given by
P Total = 120 – 75X2, hence, vapour pressure of pure A
and B respectively (in torr) are​

Answer 1

$\huge{\blue {\mathfrak {Answer}}}$

$\huge{\pink {\mathfrak {Given }}}$

$P_Total$

=120−75$X_B$ =${P_A}^o$$X_A$ + ${P_B}^o$ $X_B$

But

$X_A$ =1−$X_B$

Hence, $P_Total$

=120−75 $X_B$ =${P_A}^o[/tex (1− [tex]X_B$ )+${P_B}^o$$X_B$ = ${P_A}^o$−( ${P_A}^o$−${P_B}^o$)$X_B$

Hence,

$\huge{\green{\mathfrak {Ur\: answer}}}$

And

${P_B}^o$ =120−75=45

Hence, the correct option is C