Observe the following list of molecules. Number of polar and non polar molecules are respectively \(\text{NH}_3, \text{BF}_3, \text{NF}_3, \text{H}_2\text{S}, \text{CO}_2, \text{CH}_4, \text{CHCl}_3, \text{H}_2\text{O}\)
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Symmetrical molecules with identical surrounding atoms and no lone pairs on the central atom (e.g., \(\text{BF}_3, \text{CH}_4, \text{CO}_2\)) are usually non-polar. Asymmetry or lone pairs usually lead to polarity.