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(D) The graph represents the cooling curve of a mixture of two liquids $A$ and $B$. At point $B$ $(-25^{\circ} C)$,liquid $B$ starts to solidify. Alon

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(D) The graph represents the cooling curve of a mixture of two liquids $A$ and $B$. At point $B$ $(-25^{\circ} C)$,liquid $B$ starts to solidify. Along the curve $BC$,liquid $B$ is solidifying,so two phases (liquid $B$ and solid $B$) co-exist along with liquid $A$. At point $C$ $(-78^{\circ} C)$,liquid $A$ also starts to solidify. Along the line $CD$,both liquid $A$ and liquid $B$ are undergoing solidification. Therefore,the phases present are: liquid $A$,solid $A$,liquid $B$,and solid $B$. Thus,$4$ different phases co-exist along the line $CD$.

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