Question

Which of the following pairs of liquids are likely to be not miscible?
Select one:
A. CH3OH and H2O
B. CH3CH2CH2CH2CH3 and C6H6
C. CS2 and CH3CH2CH2CH2CH3
D. CS2 and H2O

Answer 1

Answer on Question #57309 - Chemistry - General Chemistry

Question:

Which of the following pairs of liquids are likely to be not miscible?

Select one:

A. $\mathrm{CH}_3\mathrm{OH}$ and $\mathrm{H}_2\mathrm{O}$

B. $\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$ and $\mathrm{C_6H_6}$

C. $\mathrm{CS}_2$ and $\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$

D. $\mathrm{CS}_2$ and $\mathrm{H}_2\mathrm{O}$

Answer:

The right answer is D, because these liquids have different polarities, namely, $\mathrm{CS}_2$ is non-polar and $\mathrm{H}_2\mathrm{O}$ is highly polar solvent.

Regarding another alternatives, these pairs of solvents show similar polarities so that they are miscible:

A. $\mathrm{CH}_3\mathrm{OH}$ – polar, $\mathrm{H}_2\mathrm{O}$ – polar.

B. $\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$ – non-polar, $\mathrm{C_6H_6}$ – non-polar

C. $\mathrm{CS}_2$ – non-polar, $\mathrm{CH}_3\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_2\mathrm{CH}_3$ – non-polar.

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