Question : Which among the following has the highest boiling point?
Option 1: NaCl
Option 2: CaO
Option 3: CaCl2
Option 4: LiCl
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Correct Answer: CaO
Solution : The correct option is CaO.
CaO (Calcium Oxide) has the highest boiling point at around 2,850 degrees Celsius. CaO exhibits a higher boiling point due to its strong ionic bond arising from a larger charge difference between Ca 2+ and O 2- , along with a cubic crystal lattice maximizing attractive forces. The boiling points for the others are NaCl (Sodium Chloride) at 1,413 degrees Celsius, CaCl 2 (Calcium Chloride) at approximately 1,935 degrees Celsius, and LiCl (Lithium Chloride) at 1,382 degrees Celsius.
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