Which one of the following types of liquids, with nearly equal molecular weights

Question

Which one of the following types of liquids, with nearly equal molecular weights, has the lowest surface tension at room temperature on average? a) Nonpolar molecular covalent liquids b) Polar molecular covalent liquids without hydrogen bonding c) Polar molecular covalent liquids with hydrogen bonding Which one of the following explains why water H_2O is a liquid at room temperature and atmospheric pressure rather than a gas with its low molecular weight? a) Water is a polar molecule. b) The water molecule has bent molecular geometry. c) Water experiences hydrogen bonding. d) Water is transparent to light. e) Water is necessary for all forms of life, aerobic and anaerobic.

Explanation / Answer

21) If the force of attraction between molecules increases that causes to a increase in surface tension.
Hydrogen bond makes the bond even stronger results in rising the surface tension to greater values.
   Non polar covalent compounds won't have such more attractions as polar compounds have. Therefore non-polar covalent compounds will have lower surface tension.


22) Since water molecule has a hydrogen bond, due to this the molecules bind each other. Due to this water exists as liquid state rather than gas. As the force of attraction between gas molecules is very weak.

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