Passage IV
Alcohols are carbon compounds that contain a hydroxyl (-OH) group bonded to a C atom. If the hydroxyl-bonded C atom is bonded to only one other C atom, or to no other C atoms, the alcohol is a primary alcohol. Table 1 lists the chemical formula, melting point, and boiling point for several primary alcohols.
Figure 1 shows how the viscosity (in centipoise, cp)of 3 primary alcohols varies with temperature.
Figure 2 shows how the viscosity of aqueous solutions of the same 3 alcohols varies with alcohol concentration at 20℃.
20. According to Figure 2, at 20°C, the viscosity of a methanol/H2O solution that is 10% methanol by mass is closest to the viscosity of which of the following methanol/H2O solutions?
Your Answer is
Correct Answer is H
Explanation
When the abscissa is 10%, the ordinate corresponding to methanol is about 1.3. It is approximately equal to the ordinate with the abscissa being 70%