MCQ
The concentration of dissolved oxygen $(DO)$ is cold water can go upto ......... $ppm$
- A$14$
- B$8$
- C$10$
- ✓$16$
✓
Answer
Correct option: D.
$16$
d
$\mathrm{At}$ $80^{\circ} \mathrm{C},$ the vapour pressure of pure liquid 'A' is $\mathrm{P}_{\text {total }}=\mathrm{X}_{\mathrm{A}} \mathrm{P}_{\mathrm{A}}^{\circ}+\mathrm{X}_{\mathrm{B}} \mathrm{P}_{\mathrm{B}}^{\circ}$
$\mathrm{At}$ $80^{\circ} \mathrm{C},$ the vapour pressure of pure liquid 'A' is $\mathrm{P}_{\text {total }}=\mathrm{X}_{\mathrm{A}} \mathrm{P}_{\mathrm{A}}^{\circ}+\mathrm{X}_{\mathrm{B}} \mathrm{P}_{\mathrm{B}}^{\circ}$
$760=\mathrm{X}_{\mathrm{A}} \times 520+\left(1-\mathrm{X}_{\mathrm{A}}\right) 1000$
$760=520 \mathrm{X}_{\mathrm{A}}+1000-1000\, \mathrm{X}_{\mathrm{A}}$
$760=1000-480\, \mathrm{X}_{\mathrm{A}}$
$480 \mathrm{X}_{\mathrm{A}}=240$
$\mathrm{X}_{\mathrm{A}}=\frac{1}{2}$
$\text { mole of } \mathrm{A}=50 \%$
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