Which pair of liquids is most likely to be completely miscible?
Correct answer: B. Water and ethanol
- A. Water and petrol
- B. Water and ethanol
- C. Oil and water
- D. Mercury and water
Explanation
Ethanol has a hydroxyl group that hydrogen bonds with water, so the two mix in all proportions, illustrating the rule that like dissolves like. Petrol and oil are non polar hydrocarbons that cannot form such interactions with water and therefore separate into layers. Mercury is a liquid metal held by metallic bonding and is immiscible with almost everything.
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About Properties of Liquids
Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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