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Question
Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.
Reason (R): The forces of attraction between the molecules of ionic compounds are very strong.
Options
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of (A).
Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
Assertion (A) is true, but Reason (R) is false.
Assertion (A) is false, but Reason (R) is true.
Solution
Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of (A).
Explanation:
Ethanol's melting and boiling points are lower than those of sodium chloride. This is true because sodium chloride is an ionic component, whereas ethanol is a covalent substance. Because covalent compounds have weaker intermolecular interactions than ionic compounds, the bonds holding the molecules together can be broken with less force. As a result, compared to ionic compounds, covalent compounds typically have lower melting and boiling temperatures.
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