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Explain :(a) SF_6is known but SH_6is not known. Explain. (b) SO_3has zero dipole moment. Why? (c) Noble gases have low boiling points. Explain. |
Answer» Solution : (a) Fluorine is HIGHLY electronegative and can easily cause the promotion of electrons from the filled to the vacant 3d-orbitals.  However, hydrogen is less electronegative, even less than that of S. Therefore, it cannot cause the promotion of electrons. Thus, `SF_6`is KNOWN but `SH_6`is not known. (b) In the gaseous state, `SO_3`has planar triangular structure with O-S-O bond angles of `120^@`each. Therefore, individual S-O dipole moments cancel each other and resultant dipole moment is zero.  (c) Noble gases are monoatomic gases and are held together by weak van der Waals forces (dispersion forces). Therefore, they are LIQUEFIED at very LOW temperature. Hence they have low boiling points. |
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