Which of the following liquids would have the lowest surface tension?

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Question: Which of the following liquids would have the lowest surface tension?

Options:

Correct Answer: Ethanol

Solution:

Ethanol has a lower surface tension compared to water and mercury due to its molecular structure.

Which of the following liquids would have the lowest surface tension?

Which of the following liquids would have the lowest surface tension?

Step 1: Understand what surface tension is. Surface tension is a property of liquids that makes their surface behave like a stretched elastic sheet.
Step 2: Know that different liquids have different surface tensions based on their molecular structure.
Step 3: Compare the liquids given in the question. Common examples are water, ethanol, and mercury.
Step 4: Remember that water has a higher surface tension because of strong hydrogen bonds between its molecules.
Step 5: Recognize that mercury has an even higher surface tension due to its metallic bonds.
Step 6: Identify that ethanol has weaker intermolecular forces compared to water and mercury, leading to lower surface tension.
Step 7: Conclude that among the liquids compared, ethanol has the lowest surface tension.

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