QUESTION $3$

$3\mathrm{.}1$ Reduced Phase rule:

$3\mathrm{.}1\mathrm{.}1$ What is the formula for reduced phase rule?

$3\mathrm{.}1\mathrm{.}2$ Under what condition$($s$)$ is$/$are the reduced phase rule applied?

$(2)$

$3\mathrm{.}2$ Answer the following questions based on Figure $1$:

Figure $1$: A typical phase diagram of a two $-$ component system

$3\mathrm{.}2\mathrm{.}1$ What is the degree of freedom of the area above ACB?

$3\mathrm{.}2\mathrm{.}2$ What is Curve BC$?$

$(2)$

$3\mathrm{.}2\mathrm{.}3$ What is the degree of freedom for curve $BC?$

$(2)$

$3\mathrm{.}2\mathrm{.}4$ What is the point labelled C$?$

$3\mathrm{.}2\mathrm{.}5$ Explain two practical applications of the point labelled $C.$

$(4)$

$[16]$

$.$END OF QUESTIONS